Well, for starters, one person really can’t care about every possible issue, even if they wanted to. So people and groups may get very passionate about one thing that really pulls on the heartstrings, hits close to home, or is more related to their own country’s policies. (For example, those protesting Palestine may protest US’s typically very strong support of Israel.)

What am I going to do when I wake up to the news that yet another country under the control of religious fanatics is abusing their people? Demand the US invades them? Go to the streets every single day for every new issue (of which there are countless)? Demand sanctions against their government (already broadly exists)? Fly there myself? (Not sure if possible, and what help would that do?)

Who is choosing to be silent about Iran? Lack of knowledge, maybe, but deliberate planning? That would be the fault of media and perhaps the wealthy controlling the media, if it’s happening. Not the everyday person. I guarantee you, next to no one wakes up and decides “hm, I will choose to not talk about X atrocity today.”

You’re angry at the wrong people.