In 2002, there war in Iraq had large popular support, something like 70-80 percent. It took a few years for people to realize it was based on a lie and was a massive mistake. It was also morally reprehensible, but that part is not often discussed in mainstream US politics.

If you compare that to the current Iran war, a majority of the population is already against it, however the current administration doesn't seem to care much about public opinion, and there doesn't seem to be much that the public can do about it.

Yeah I was there too and I don’t know what this guy is talking about. Gen X was highly politically active. This was the era of violent in the street anti-globalization clashes like the WTO protests.