When you have large organizations, such as giant insurance companies or governments, dictating whether people can have care or not, when they ultimately say no to certain people, they will be mad, and perhaps set their targets on the CEO’s or government bureaucrats that denied their care.
And I have seen block lists where most of the stuff is toxic and should be blocked, but then mixed in there are people who pissed off the person maintaining the block list, usually over some petty dispute or the fact that they voted for the wrong guy in the last election. Unfortunately a lot of these distributed block lists wind up becoming the maintainer’s personal weapon against enemies.