Israel have been taking over Palestine for as long as can be remembered, they started by claiming its their land and by killing Palestinians. They also would take Palestinian kids from their village and torture them trying to give Palestinians a hint to leave. Jewish people are lovely. Israel is not.
Ending Israel would in no way guarantee world peace and quite frankly it would probably do nothing more than stir up more problems in the middle east as every other group attempted to control that area. The middle east has been a hot bed for fighting for centuries and there is no simple solution to end it, because each side wants only their way.