I'm responding to the "Eventually" you wrote. When you're digging yourself a grave, the sooner you put down your shovel and get out of the hole, the better.
I live in LA and personally know families who spent time in those camps. I also know screenwriting families who lost their jobs during the 1950s Hollywood blacklist. So yes, those mistakes were real, and they can divert the course of lives for the worse.
In the flawed world we live in, it takes time for people to change their minds and muster the political will to roll them back. This is generally prompted by over-reach. For example, as the cold war started to cool off a bit, the Church Committee (http://en.wikipedia.org/wiki/Church_Committee) and the Pike Committee (http://en.wikipedia.org/wiki/Pike_Committee). Maybe we're seeing such a time now.