The problem is that you can be angry all day and it won’t accomplish anything without coordinated, planned, collective action. And collective action is made more difficult with angry people.

I disagree. People who aren't agitated make for poor partners. They're unreliable, uncommitted, and easily wooed by empty platitudes from the folks committing the offenses.

Anger motivates you to act Right Now, which is why it’s good for reactionaries.

Generic always-on anger burns you out and turns you into a cynic. It's the cynicism that reactionaries feed on. But when you have a baseline moral position and you can recognize what does and does not rise to the level of offense, you can leverage outrage productively rather than feel sour and hateful all the time.

Progressives have a lot of trouble hitting the slow-burn simmer of anger in a way that’s motivational and doesn’t slip into despair when you get tired from all that rage that you can’t turn into immediate results.

Progressives (in the US) have a hard time mobilizing large groups toward productive action because they lack the resources and the institutional structure to mobilize individual activists into a collective workforce. When progressives get access to these kinds of resources, they generate enormous social value in a relatively short amount of time. The despair we routinely see in progressive communities stems from groups that are fractured - often deliberately so - and undermined by state and corporate institutions.