Because more Jews were squeezed into Israel than Arabs who were squeezed out.
These Jews also lost everything.
And unlike Israeli Arabs who at least from the declaration of Israel got an invitation to stay there as citizens, this option was not offered to the Jews of surrounding nations.
Furthermore, if you want to go back in history, note that Israel was not originally suggested because of WW2 and Holocaust, but decades before because of Muslim harassment of the Jewish minorities in their countries.
Just like Pakistan was created as a national home for Muslims to protect them from Hindus.
Feel free to see for yourself and also to ask why absolutely nobody in UN or the "unbiased" media or schools has told you this before...