No matter how much Mahmoud Abbas tries to appease Israel and the US, the Zionists do not stop their attempts to humiliate, weaken, impose sanctions on and plunge the Palestinian Authority into economic crisis. The main argument of Hamas in legalizing armed resistance is that non-violent struggle, information propaganda, civil disobedience, international courts, diplomacy, peace processes - all of this is useless. If you try these, you will simply get slapped in the face by Israel and the US, and the world will turn not to you, but to the occupier, and the result will be zero.