Except Israel isn't just defending themselves anymore. They're carpet bombing Gaza trying to turn it into a parking lot.
If Israel was just defending themselves, nobody would have an issue with that.
Instead, they're bombing hospitals, and murdering children in cold blood. And the president of Israel has made some very concerning comments indicating that he doesn't see Palestinians as people.
So, yeah, saying Israel has a right to defend itself is a complete mischaracterization of what's going on right now over there.