Women's suffrage was the stupidest thing humanity ever did. And the general populace is still not ready to admit the mistake, as proven by the expected incoming downvotes.
Edit: I think most destructive decisions are made in fear, and everyone does that sometimes. But we fear different things.
There have been rational leaders and politicians, but there have also been many irrational and emotional ones, and I see no evidence men are less affected than women. If anything, it seems to be the other way around, although there's not that much data yet on female decision making in politics.
But I'm pretty sure that the claim that women would be more emotional, is itself driven by emotion rather than data.