"THE most powerful of all the Pharaohs was Thothmes III., who has been called the Egyptian Alexander the Great. When Egypt threw off the yoke of the Hyksos, its native sovereigns burned to avenge upon Asia the injuries suffered from the Asiatic invaders. Hence one Pharaoh after another led his army into Palestine. Thothmes III. won a great battle at Megiddo, completely conquered Palestine and Syria, and extended his frontier to the Euphrates River, threatening Assyria and Babylonia."

* Who first INVADED Egypt? If a people are under the yoke of a people for long enough and begin to understand the patterns of these invading people as being warlike and not playing fairly, who do stop incursions except through threat of violence, what is the proper response to these invaders? I am not justifying violence or the course of action Egypt took after the expulsion of these Asiatics, but you have failed to mention the "Hyksos" invasion and take over of Egypt, which is the CAUSE which SPAWNED the reaction of the Egyptians to these people.

"What is the root of all this war mentality?"

* Religion that defines war and conquering as a sacred duty. Look at Aryan thought, look at Semitic thought - I think you will see a pattern.