It's not the buildings that are a problem, it's the people running them. That's either the owners for private prisons or the prison guard union for public prisons. If you say "private prisons are bad for <these reasons>" but there's just as many problems (and mostly the same) with public prisons, then focusing your hate on private prisons isn't working on the real problem. The legislature sets the standards for both and could actually fix the situation, they have both the responsibility and the power to do so.