It also sounds like the events that you mention were dealt with quickly and severely, maybe they would have been more severe threats given the space and time to form more completely.
My fear is that we'll get to a point where people won't know about the suffering or injustice that is occurring in the world without physically going to the places where it's happening. Or that people will have to go to extreme lengths or break the law simply to escape their filter bubble.
/tinfoil hat
In the case of draft resistance in the world wars, perhaps. We did win those wars within 2 and 4 years of the US entering them, respectively.
In the case of the Hollywood blacklist, the Communist screenwriters became a cause celebre and, once the anti-Communists went overboard, were rehabilitated within Hollywood. This is despite the fact that they were members of an organization under the control of the USSR under Stalin. To some extent there was even an informal counter-purge of Hollywood conservatives who supported the blacklists and investigations.
> My fear is that we'll get to a point where people won't know about the suffering or injustice that is occurring in the world without physically going to the places where it's happening.
Ah, back to the last hundred thousand years of human history!