I think May was trying to do the right thing -- and I really don't think it was primarily motivated by hubris.   It didn't make sense that she triggered Article 50 beforehand though.  Whoever advised that should be turfed as they are probably a saboteur.

The people I see as truly responsible for the mess are David Cameron, Nigel Farage and BoJo.   David Cameron seems to be "first among equals" on this one though.