Here's a few disorganized thoughts on this and on Jules, split into several sections.
* * *
What's curious about the assessment of Jules is that she is being judged by a different standard than at least one other character. You say that you dislike her because of her poor choices and criminal activity, but other characters have also made poor choices and committed crimes, or highly dubious acts.
Some of Jules Kendall's lowlights include:
* Stole a piece of jewelry from a store in California a few years ago
* Set off fireworks illegally in city limits
* Attempted to help spy on and steal things from Wooton Bassett
* Lied repeatedly over a variety of things whenever she got in trouble
* Encouraged Buck to commit minor crimes whenever it was convenient for her personally
* Covered up others' underage drinking, though she didn't drink herself
* Set off smoke bombs in the school
* 'Borrowed' (stole) Connie's car several times without permission
* Committed a hit-and-run
* Was willing to let Connie take the blame for it
* Broke one of Connie's wall hangings
Compare this to the record of a known villain, Rodney Rathbone, who, among other things:
* Beat up various kids over a long period of time
* Endangered children by having them run out over ice
* Committed various acts of vandalism and criminal mischief, including setting off the sprinklers in a school, and vandalizing Whit's End, the church, and the Harlequin Theatre, among others
* Plotted other acts of vandalism, and may have eventually committed some of them, including setting school property on fire, and egging a nursing home
* Forcibly painted a child's hair blue
* Stole school tests on various occasions
* Framed Mandy for one of those times
* Stole other items, like Tom Riley's apples, a security tape at Whit's End, and a statue he believed was valuable
* Lured a minor (Lucy Schultz) into a situation comparable to kidnapping
* Witnessed an attempted murder and did nothing to help
* Forged a historical signature and attempted to sell it as memorabilia
In the categories where Jules has done similar wrong things as Rodney, Rodney's actions are worse (even to the point of being cartoonishly despicable), and as far as I recall Jules has never beaten anyone up, or even threatened to. Why then do we find Rodney acceptable (in that we still enjoy listening to his character), but Jules has gone too far?
The first difference to come to mind is expectations. Rodney is 'supposed' to be a bad guy, so bad behaviour is the norm, while we have cast Jules as a protagonist. Decent people don't do what she's done, so she is 'failing to play her role', while we don't expect any better from Rodney. This typecasting is strong enough that even the comparison (Jules Kendall to Rodney Rathbone) seems absurd.
Another difference, highlighted in the most recent episode, is that Rodney does have one line he won't cross: he is loyal to and respects his parents, and isn't willing to openly defy them. Jules, on the other hand, has repeatedly undermined Connie or gone behind her back, and her recent tantrum may exceed any level of disrespect we've seen from a major character in the history of the show (although a few characters, like Monty in "Member of the Family", or Alex in "No Boundaries", have come close). (The fact that you can point out some area where Jules is worse than Rodney is incredibly unflattering, pointing back to the previous difference.)
There's also a difference in perceived maturity. We have always known that Rodney is immature, to the point of being 'developmentally disabled', as far back as his earliest appearances. But Jules is apparently, other than her troubled background, a normal teenage girl, who has normal accomplishments and capabilities, and can be expected to hold up normal responsibilities. Rodney gets a pass because he isn't expected (there's that expectation again) to learn or to know any better, but we think Jules ought to. "To whom much is given, much is required," I suppose.
* * *
The most comparable arc I can think of is Aubrey's, but there are a few important differences in their characters that contribute to the results we're seeing.
* Aubrey came from a stable and loving family background, and she felt the same way about them, even if she wouldn't always admit it. Jules didn't have this until relatively recently.
* Aubrey was a bit younger during her 'dark period' than Jules is now.
* Aubrey is a deeper thinker than Jules.
* * *
What this episode reinforces, the same as in her trip to California, is that Jules, for all of her talk about being 'stifled' or 'controlled', is not an independent person. If someone else proposes something, she goes along with it. Even when her conscience is triggered, it only takes a little bit of pressure before she eventually agrees with everything they tell her to do. Given that tendency of caving, I was surprised that she openly rebelled against Connie at the end of the episode, but she was probably 'fortified' by a conversation with Valerie in advance. The fact that the choice seems to be 'having fun' vs. 'being responsible' might have helped push her over too.
As far as the dubious quality of her decisions, I think that speaks for itself. I'm not yet acquainted with whatever Bridget supposedly did to Jules, but I don't see that it could possibly be worse than what Valerie did before this episode on multiple occasions, ranging from blackmail to setting Jules up with a massive bill that she couldn't pay off. I wouldn't even be surprised if Valerie rigged the smoke bomb to malfunction so that Jules would get in trouble (although given that she has little love for Bridget, she probably hoped that it would work out so that she could 'take out' both of them at once).
In any case, the folly of Jules putting herself in a situation where she is totally dependent on Valerie's goodwill is clear. The album cover implies that she will soon be injured and probably abandoned in the woods somewhere.
But even if she is less likable now than she has ever been, I project that by the end of this album, she will come to herself, and we will see things begin to turn around.