On my side, and to build on top of what you've said here, I think the article misses the point of the fact that anger is a useful and healthy societal tool.

The naive disney approach to anger is "you should not be angry, it is baaaad". But anger is an important signal to put limits on what is not acceptable to do in society. If my neighbour throw their garbage over the fence in my garden, me being angry at them is the uncomfortable situation they will be faced with and that will teach them it is not acceptable. Alternatives don't work: any other response will signal that what they've done is in fact "not that bad afterall, otherwise people would have been angry".