Regarding the rights of the Jews' claims to Jerusalem and their ancient lands: War and Conquest by nature do not only kill people, they remove the rights of human beings. If anyone values the work done by groups like the Red Cross (which tries to restore human dignity) then you have no valid reason to deny people the dignities they had before being killed and conquered. Israel is the ancestral home of the Jewish people and the Jewish religion, a home that they were violently forced from.
The actual history of the land is far more complicated than many are saying.There was in fact a forced Diaspora, it is not revisionist history.