Drug addiction causes direct physical harm to the user. If you remove the monetary cost, the other social harms are mostly resolved. There is very little danger to anyone other than the user if we treat substance addiction as an illness in the way described in this Tumblr post.

Sexual assault, by definition, harms other people besides the person who has the psychological problem. There is not really a way to treat it as an illness that mostly resolves the social harms.

I think that violent offenders should be kept away from the rest of society to reduce their ability to harm others. I think some of them are truly remorseful and can be rehabilitated, and those people can and should receive treatment and be reintegrated after they are no longer dangerous to others. I think some offenders are psychopaths who cannot be rehabilitated, and the only way we protect our society is to keep those people imprisoned indefinitely.

All of these things can be true at the same time, but internet forums are usually not conducive to nuanced conversations about complex topics.

I haven't followed Russell Brand's legal case. Has he expressed remorse and sought help, or has he just denied having committed a crime? I don't think we can help anyone until they admit that they need help.