Yes, i think he deserves better than to be raped in prison. I'm not sure how this is a controversial stance.
It's not a matter of what he's done. What he has done is enough to get him removed from society, put in a small box and forgotten about for many years.
The question is what gives us the right to, essentially, sentence someone to be sexually assaulted.
Prison rape is a disgusting thing. It's a horrifying display of savagery and brutality, and taking enjoyment in its occurrence is condoning it as an acceptable aspect of the justice system. I find that sick.
We all agree that what he did was wrong and should get him taken away from society. The largest part of what he did wrong was to commit (or plan to commit) sexual assault. If we all agree that the sexual assault he perpetrated was wrong, how can we cheer on the idea of him being sexually assaulted?
Prison rape is a horribly common, deeply disgusting thing. It sickens me to see people taking enjoyment out of it.