as for abolishing jails...
there are some nuts out there, like jeffrey dahmer, or that guy that beheaded somebody on a bus in winnipeg. these cases are extreme, but there has to be some kind of system that deals with them.
the thing is that these are, at their core, mental health concerns, and that these people should be in hospitals, rather than jails.
so, my basic position is that what we call jails should be converted into hospitals - and that the only people in them should be people that we have no choice but to restrain for our collective safety.