Donating to Terrorism

I don't understand all the billions being donated to Palestinians after their Gaza War. They need to be paying reparations to Israel to pay for the cost of the war, which was all their fault. The West is stupid in that it keeps paying the terrorists to buy more weapons, then bombs the terrorists after they kill civilians, which is what terrorists do. The only people making money in this scenario are the arms merchants, who apparently control our governments through bribery and corruption.