This is the big problem with a DIY site - one day someone's going to post something so incredibly wrong it's going to get someone killed. Hopefully the community will jump on it as soon as they see it and recognise it's wrong - but what if they don't?
A minor example is this answer regarding asbestos removal - by the op's own admission the task as as dangerous as smoking cigarettes. And not to mention totally illegal in a lot of places.
What should be done? Should anything be done? Someone who's qualified really needs to be making decisions regarding nuking these kinds of answers, not DIYers.