There are a few problems here...
Gazza is a glorified prison which can't exist under Isreali restrictions.. There are two million people there with no place to go...
Hamas is popular because pacifists don't win when you are daily unconstant threat... There is a large group of Isreali Hardliners that don't believe they should exist either.
West Bank is run by Fatah and organisation which has attempted to engage in peaceful dialogue. The ilegal Settlers are a major problem as they are driving them off their land under the protection/backing of the IDF. This is just a slow invasion which any one can see in the timeline.
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This has nothing to do with defence... This is about an invasion.
Think of it logically, if a foriegn people came in to your neighbourhood and took land and the army moved you out so they can have a buffer zome. Then more move into the buffer zone and then you are moved again... How would you feel?