The US funds both sides because the military industrial complex wants constant war.
The Biden administration sent $billions to Iran which they spent on rockets to fire into Israel. They fund Israel who buy rocket defense systems from the US.
"and as long as they stay on their own patch - that's fine."
The problem is the terrorists don't believe that Israel has the right to exist, they want to exterminate them, how can you have peace if one side won't accept the other side even has a right to live. (from the river to the sea.)
