This is the same type of reasoning that gave us the Patriot Act/Homeland security etc., though. I'm sure there is some truth to it, I just hope people push back against giving the FBI, or whatever agency arises, free reign. Tilting in favor of extreme safety measures sounds pretty bad to me, but I guess this is largely a matter of personal risk tolerance.
Notably, none of the content the FBI was monitoring in this thread had anything to do with terrorism, but that fear is still guiding many people's responses.