I’d argue there are two different but related uses of anger. The first is as you said, just getting your followers angry at something, and keep adding new things to get angry about, so they never stop and think about whether it made sense in the first place.
But there’s also doing things to make their opponents angry, to play into their followers’ vindictive streak. In fact, you can even mix the two, coming up with something to be angry at their opponents for, but also that makes the opponents angry. See this thread for an example.
https://boards.straightdope.com/t/new-florida-senate-bill-would-eliminate-state-democratic-party
They have no intention of that actually passing. But that isn’t the point.