The rule of law is important. Tit-for-tat exchanges like the ones that Israel and Palestine are engaging in solve nothing. It descends into monkey hindbrain us-against-them.
Another very similar scenario recently was Northern Ireland. That didn't get solved by the UK grinding Ireland into the ground or posting inflammatory things in the news - it was solved by both sides showing restraint and good will.
Currently neither Israel or Palestine are showing anything of the sort, but as the larger, more powerful party (eg. I doubt Palestinans have bunkers), it's up to Israel to show some restraint... but they aren't, they're still posturing about how tough they are.
