BleachBit is a very nimble tool in the hands of a computer-savvy user. It can be dangerous when used by novices, but even the worst case scenario should only result in nothing more than an inconvenience and the need to reset some options.
Lacks documentation as well.
Edit: Might as well be constructive right? Give CCleaner
a try, it does just about the same thing and it's a little more 'trusted.'
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?