If you base your self-image of yourself as a good person on your fight against injustice, if there is no major injustice around you’re forced to elevate minor injustices to such status.
BTW, this also, to a considerable extent, explains the huge number of hoax racist attacks and rapes. If white supremacists don’t conveniently show up for you to heroically resist, you have to invent them.
“If you base your self-image of yourself as a good person on your fight against injustice, if there is no major injustice around you’re forced to elevate minor injustices to such status.”
Outstanding insight. That is what the author was saying. Progressives want to have a cause bigger than themselves and which make them feel important and good about themselves and morally superior to others. Since they have rejected god and Christianity, they have to search for something else, like gay rights, global warming, abortion rights, etc.