Push somebody over the edge

Question

From TheFreeDictionary, pushing somebody over the edge is defined as:

If an unpleasant event pushes someone over the edge, it makes them start to behave in a crazy way.

Can crazy here be to mean all of the following: non-sensible/stupid, very angry, and mentally ill/insane?

Answer 1

Pushing somebody over the edge alludes more to a loss of control which might then be manifested via anger, insanity etc. I'm not sure that stupidity is necessarily associated with it. But I suppose irrational decisions could well be categorised under stupidity ...