As has been said elsewhere in the comments, the point isn't about the severity of his crimes. The point is that people shouldn't be treated so poorly in prisons.
The idea that it's okay to horribly mistreat prisoners because they're 'bad people' is ghastly and outdated. The purpose of prisons should be to keep dangerous people away from regular people, and to rehabilitate the people capable of rehabilitation, not to punish 'bad people' because it makes us feel good.
The idea that it's okay to horribly mistreat prisoners because they're 'bad people' is ghastly and outdated. The purpose of prisons should be to keep dangerous people away from regular people, and to rehabilitate the people capable of rehabilitation, not to punish 'bad people' because it makes us feel good.