They aren't thinking, really. If you look at the online comments from people who support these actions, you'll notice these characteristics: they are usually listing the same talking points, using the exact same collection of key words or "facts" (even in different languages, across different cultures) often strung together like chants, have a conspiratorial notion of a hidden puppeteer directing events or people they disapprove of, conversely they often have a messianic belief in their chosen prophet, and they are usually inexplicably very angry.

You will also notice that the vast majority of them very rapidly, and across cultural boundaries, start parroting the latest talking points. Talking points that didn't exist days before and weren't on anyone's minds.

It's a form of mass hysteria.