A mandate is not ownership... just so you know.. the Brits did not have the authority to give the jews any land in Palestine.
And again, you make it sound like the entire region was already developed and settled by Arabs. The hundreds of thousands of Jews that migrated into the Mandate from 1918-1948 didn't displace a single Palestinian. And the vacant land that the Jews settled could become Israel because Jews were a majority on those lands. The British and the United Nations merely recognized that fact.
i don't know what they taught you at school, but when more than 300 civillians are killed, it is a massacre.
Besides, the number of civilian casualties in Deir Yassin was not abnormal when one takes into account the fact that house to house fighting went on in the village for days.
Also, it would have been unusual for the Israeli unit to plan a massacre and then give Deir Yassin's civilians a warning to get out of the village before it was attacked, which is exactly what they did.
You can't say "they left willingly" and left the land vacant.
Palestinians didn't flee the Gaza Strip en masse during the war only to have Jewish settlers strut into their houses or something. After the war, Jewish settlers voluntarily entered Gaza and settled on vacant land.
Some sources originally reported a death toll of around 254, but that number has recently been shown to be a contemporary exaggeration that was disseminated for a variety of political reasons.
Yet the attack was carried out by underground paramilitary dissidents who were not acting on behalf of the Haganah.