I do think people change, but it happens slowly, not quickly. Kubrick's ending still leaves us with the ability to imagine an older, wiser, regretful Alex. But you can't credibly force that into his youth, and the movie is already 2 hours 15 mins.
He just decided at one point that his current lifestyle was boring and he wanted a change. He didn’t turn into a good guy, he just decided to go a different way. Thats the point is that he made the choice himself.
> Kubrick himself, in response to a series of murder trials where the defendants explicitly mentioned his work, requested the withdrawal of A Clockwork Orange in the United Kingdom, where it could not be seen again until the director’s death in 1999.
You also hear examples of "suburban father tries to make meth because of Breaking Bad" but those are one-off individuals who are probably not of sound judgment.
The problem with demonizing things is that demons are cool.
If you want your condemnation to be effective in fiction you have to make the characters doing it pathetic miserable losers. You can even have the narrative support them, they win in the end, and set it up so they were right and people will still come away with that they're bad.
Having read the book and seen the movie adaptation I have to disagree. Alex is charismatic, popular, a feared leader, independent, and rebellious. The brutal rape scene while singing makes him look like an absolute badass (a la the Joker) existing well beyond the reach of society's rules and importantly, makes him look powerful. Ultraviolence sounds like an achievement in DOOM. When he's caught it's framed as a betrayal not "we finally got the bad guy." Then they make him sympathetic through the torture and weakening him and making him unable to defend himself to the point of being driven to suicide. It's harrowing, not the cathartic comeuppance of a terrible man. And then the police apologize, let him go and arrest the man he brutally beat to near death.
The narrative considers Alex to be horrible but the view as seen by the camera/reader thinks he's hot shit and a tragic victim of a dystopian society.
As another example, when you watch Dexter you're rooting for Dexter and the show makes him cool despite him ya know being a killer.
In a lot of ways I think it's actually a hallmark of media literacy that readers/viewers largely ignore the narrative as a source of moral judgment because it's fiction and we like compelling villains and instead finds it in how the characters are actually portrayed.