When peace treaties were signed with Egypt and Jordan,Israel offered to return the West Bank and Gaza,but both Arab nations REFUSED. They wanted them to be a thorn in Israel's side,to have their own people live in misery,and for those lands to be USED as bases to launch attacks upon Israel.
Even so,Israel restrained itself(with a lot of "persuasion form the US and West),never truly defeating those territories. that has cost Israel dearly. That has to change. Israel must eliminate Gaza as a missile base and set an example of how war will be conducted from now on.