Do you believe the Ludovico experiment was immoral?
The argument against the experiment is that removing one's ability to choose from right or wrong disables the person's free will and it's a huge dystopic breach of freedom.
Does it do so anymore than prison, or the death penalty for that matter? Had the sentence been "put him to death", it would've been a much simpler controversy.
In this situation, Alex consented to be part of this experiment. It allowed him to skip the vast majority of his prison sentence, be free and to potentially stay out of prison. Not to mention, he was a reprehensible sociopath and criminal to be
Before I watch the movie, I heard things like "Alex gets what's coming to him", but in all honesty, Alex got a pretty good deal. He got his prison sentence waived, he got medical treatment and, even after things didn't go according to plan, he even got a sweetheart deal from the PM. The experiment was only two weeks long and it wasn't nearly as gruesome as something like the Stanford Prison Experiment.
Most of the harm he faced in the third act of the movie were private citizens getting revenge on him (and even so, he wasn't dealt nearly as much pain as he inflicted). And it worked out for him in the end too.
There can, of course, be questions about the effectiveness of a program like this. But the moral arguments seem to be glib. It's kind of like opposing stem cell research because it's "playing God", or taking the passive side on "the lever problem".