This thread is called 'Israel and Gaza', yet you posted a link, (and the only form of verifiable support to what you've said recently), to a short-lived 1970 conflict that did not involve Israel, did not involve Hamas and wasn't in Gaza either. Consequently it has no relevance to this thread. If you want to discuss it further I suggest you start a 'Black September 1970' thread.
This is highly offensive as you are implying that all Palestinians are like that. Name a country country that hasn't had some form of terrorist activity in the last 53.5 years. Following your logic we should say that Catholics and Protestants have a track record of violence and terrorism, as they were killing each other in Northern Ireland less than 30 years ago.