He was a a paper tiger. He simply did not have the military to invade Israel. US intelligence said this. After the war, Rabin and Begin said it. It was Israel that lashed out (after some provocations) and seized large amounts of land.
Report: U.S.-led strikes in Iraq, Syria killed 459 civilians (AP)
from the article: Heading toward an irreparable rift between U.S. Jews and Protestants