China in Tibet, China's treatment of the Uyghurs, Russia's war against Ukraine, Kony 2012 etc, there are lots of causes where the local government in whichever country you look at isn't actively involved, yet there was a lot more public noise and campaigns.
I don't know what the answer is, but "my government doesn't deliver weapons to them" hasn't been a reason before, so I don't see why it would be now.
The Uighur is easy: Nike and a lots of western brand used Chinese work camps. In my neighborhood that's what people protested, not really Chinese treatment of their minority, but the fact our brands used slave labor. Nike and all no promised they wouldn't use slave again, the Uighur are still discriminated and forcefully sterilized, no one care anymore in the West.
Russia war against Ukraine is very different, it's the first war in Europe since the 90s, and the first "real" war in europe since 45 (I guarantee you if Ukraine folded in 3 days, no one would have said much). Also, Europe is financing the Russian war economy, which is easy to protest.
The US government wasn't a friend of Kony in 2012. Before Trump 2, the US were not that friendly with Russia, yet people protested in many places around the world to show support for Ukraine and to voice their opposition to Russia's imperialistic wars, being aligned with their governments' position.
It's different with Iran. Some of that is likely to be Iran's lower profile, but not all -- it's not like media outlets are not reporting on it at all and you have to get your information from niche sources to hear about events in Iran.