easy 2 things - 1 is religion & 2nd is land.
You see there is no israel last time.
In 2nd world war, german prosecute the jews, thus a lot of jews
flee ....or got kill or lock up,
After the 2nd world war, US and other countries - UN decide to give
the jews a piece of land ... to re-settle them down. So they give
them a piece of land in the middle east - that is isreal. However
soon the middle east folks are not happy because that they feel is
their land which is give away. So that lead to the middle east war
... six day way. But by then the isreal has grown strong. They in
fact won the war and capture more lands ..... and isreal grow in
size.
So what happen part of isreal is actuall palestine land
which they lost when they attack isreal and lost.
Of course the palestine - are treat badly by the isreal that is
because they attack isreal and lost ... But then palestine try to
wipe out isreal in the first place ... and they still have this
dream, and they do not seem to be giving up on it .
The issue is hard, 1st even isreal give bad the occuipped
territories, the palestine are no happy till isreal is totally
destoryed . On isreal side, there is no way for them give back the
lands also as more jews have come to isreal and have already settle
down on those new lands ....