The free flow of information and lack of government control over access to that information. Much of the early Iraq war and even, to an extent, conflicts with ISIS and Yemen had the benefit of those citizens not having access to the internet. So any information many American citizens were getting was filtered through what the military allowed to be known, then further filtered by the news.

With Palestine and Israel, we were able to see it with our own eyes. I remember specifically watching TikToks of a teenage girl in Gaza posting about the evacuations, hearing the bombs in the background, etc. It felt "real" to us, which is a terrible way to put it, but I believe that is why the protests are much larger than other conflicts.