Any addiction is a terrible thing. A physical or psychological dependence to a chemical drives people to do bizarre things. A person deep into their dependence will do anything to reacquire the euphoria, especially when the symptoms of withdrawal start. When external substances (sugar, caffeine, meth, opiates, etc.) enter the body, they activate the body to release endorphins. The problem is how much is released. On a scale of 1 to 10, let's say the euphoria from a climax during intimate relations is a 3 and lasts from 3 to 10 seconds. A dose of heroin will give you an endorphin release of like 100 for an hour. The down side is that these off-the scale rushes kill the cells that produce the endorphins. Which means your next high will not be as good and you have to increase the dose to overwork those remaining cells even more just to achieve the same high.
Also considering that the part of the brain that registers pleasure and the part that registers pain are in the same area, some people achieve their high through some form of pain. This is because if the pain is too much, endorphins are released to mute the pain signals. Which is why there is a subset of the population likes being tortured. Not torture torture mind you, rather being restrained and lightly flogged, whipped, etc.
I bring these points up to support my statement, Leftists are addicted to anger. The anger they feel when they see an injustice in the world and they want to fix it. Like people who smoke meth feel great after a hit, Leftists feel great whenever they go "all-in" on their cause. The problem is, like illicit substances, that high fades after a while. Which means the Leftist has to take a bigger dose of the SJW wokeness to achieve the same euphoria. This also explains why Leftists are always switching targets, because the euphoria fades and they must rage at something else to regain that righteous level of anger.
I honestly don't think there's a cure. Certainly no rehab facility that I know of. We can only wait for an individual to grow weary of the anger and at that point we can present facts and logic to hopefully bring them to reason.