Although admittedly they were not angels the Etzel & Lehi mainly targeted British soldiers and military targets in Palestine they didn't go around killing arab civilians. In the 30 & 40s tensions between jews and arabs increased and there were incidents of jew and arabs killing each other the target of jewish resistance fighters were the British. The King David Hotel it was not just a hotel it was British intelligence HQ in Palestine. The jews placed a bomb in the basement of the part of the hotel used by the army & only that part, they gave telephone warnings to the British which were ignored and they gave telephone warnings to surounding buldings. When was the last time a palestinian gave a phone warning? The Park Hotel bomb that wasn't a military target like the KDH was it was a regular hotel full of guests from all over the world ( not just Israel ) who were there for the sole purpose of celebrating a Passover meal and religious service. How many busses did the jews blow up. The real fighting against the arabs didn't begin until the war of independence began when alot of arab villages were hostile and fighting against jews. The arabs certainly didn't learn the idea of suicide bombings because jews actually value their lives and want to live as long as possible they don't dream about martyring themselves. As I said in the begining the jewish groups were no angels but you compare them to palestinian terrorists and the jews look like Ghandi.
from the article: Erekat: No unilateral declaration of Palestinian state