Fair enough. My instinct is that qualified immunity is such a common target because it's not an emergent property of the system that would potentially require structural changes to fix, and that lawsuits are often the only remedy people have for the structural problems like the ones we're talking about. Being able to "have your day in court" is at least theoretically the way that regular people can get justice when the system fails them, so when the system adds another layer of protection onto itself to prevent that with virtually no constitutional basis via judicial review (and therefore could also theoretically be removed in the same manner by a future court more sympathetic to victims of injustice perpetrated by law enforcement), it's kind of hard not to fixate on that.