Rank-and-file leftists have been programmed to believe anything that angers conservatives is to be supported.
I think there's a lot of that. There's also IMHO an element of escaping responsibility. If a person knows the government is corrupt, yet halfway believes the left's lies that the government will take care of his needs and wants, then the person will allow himself to not worry about taking on personal responsibility for his future.
I phrase it in language like "allow himself" because that's how I sometimes hear it. With some of the Dims' voters it's not about die-hard-allegiance to leftism, but about more like a drug that someone takes to get high to not worry about today's or tomorrow's needs. Often the person knows it's not good in the long run, even for himself. But with the high he can kick the can down the road (using a political phrase for how some people mentally process how voting Dim allows him to procrastinate on his personal responsibility).
When (not if) the businesses in their neighborhood decide it is time to leave, then the deep state and their lackeys in media, churches, etc. will blame racism or greedflation or anything but the real cause and the rank-and-file leftists will buy it.
They may be adults, but drugs, what masquerades as an education system and their social circles have prevented them from getting a fully developed brain.