I don’t know if you are American, but I am. Sure, I don’t support Iran giving Hamas weapons. The issue is that Iran isn’t my government and they certainly don’t give a fuck about my opinion.
The human tragedy in Gaza is enabled directly by MY representatives and funded with MY tax money and given diplomatic cover for atrocities again and again by MY government. Nothing my country is doing enables what is happening in Iran right now.
The situation is less pronounced with Europeans, but not dissimilar. The EU has sanctions on Iran, unless I’m missing something? And frankly yes, if American support for Israel ceased I think Europeans would complain less because Israel would have to stop a lot of their behavior.