That's not the part we have a problem with. It's that there was already people living there before and now they're using this supposed right to exist to wipe out the local population. Ironically they don't believe that Palestine has the right to exist.
Colonialism has always been bad, Israel is clearly no different.
"They" are me, I am a religious Zionist Jew. I believe that Palestine has the right to exist, just like Israel. Israel is the land of our ancestors, which was ruined by Romans and then settled through Arab conquests (Arabian colonialism was a thing). This is fine, this was a long time ago. We were there even longer, but it is not the time to compare.
If Palestinians consider themselves a nation, they are a nation, just as we are. Neither of us should try to destroy each other.
Colonialism has always been bad, Israel is clearly no different.