In World War 2 why did the dictors think they could take over Europe and other places??

3 answers

Dictators often have megalomania.

http://en.wikipedia.org/wiki/Megalomania
ok, so crazy or huge ego's right? Sounds like North Korea person.
They did not act alone. they were encouraged by many wealthy financiers. Fritz Thyssen (a member of I.G. Farbin Industries A.G.)was one of Hitlers first backers. Media supported him, He was Time magazine's Man of the year, TWICE! (before the war).

Emperor Hirohito Came from a family of rulers who all Japanese people thought were actual gods.

This is a huge subject, best addressed by Dave Emory, Google his name, or Spitfirelist for his analysis of fascism and its causes.