What stats do you want? Percentages of people who try or succeed in committing suicide? I dont have 'em.
Why dont you check out some of these sites though. If someone actually needs to be convinced that prison is hell.
http://tommysilverstein.bravehost.com/
http://solitarywatch.com/
Or check out the doc on netflix called "solitary confinement"
Or watch "Lockup" on MSNBC. Older episodes especially that are focused on the state prisons rather than the local jails that are the focus of more recent episodes.
Or watch "Beyond Scared Straight"
There's a website I cant find that features documentation on conditions in the Texas system specifically. Wish I could find it right now. It's horrendous. DO I feel sorry for them? Should I? Is there a better solution? I dont have good answers. What I do know is that I dont want to REWARD them for their criminal acts, so making sure prison sucks seems to be the only alternative.
However, what I am hearing from you is that unless i can provide statistics that prisoners would rather die than be in prison, that prison is not cruel and unusual and as such does not violate the constitution. Am I hearing this correctly?