It is indeed true that if Simon had lived long enough to tell the boys that there was no beast on the island and that the Lord of the Flies is none other than a Sow's head on a pike, things might have been better. However, Jack has succeeded in turning the boys into savages and the moment Simon died, chaos began on the island. Piggy (the voice of reasoning) died and Ralph became a prey.
The argument is good, but you have to check for some errors, typos. E.g "When we were first" and Ralph instead of "ralph"
Most would argue that any time of hatred between groups of people is indeed based on ignorance, because people tend to dislike and fear what they do not know.