These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Roosevelt-Truman administrations did have Communist sympathizers in them. However, that doesn't change the fact that few of McCarthy's claims were substantiated in the hearings. So more like "strawman's political maneuvering happened to align with reality."
The point is that only one of the people McCarthy accused, Mary Jane Keeney, was actually anything close to guilty. Even then, McCarthy accused her of being a Communist party member, which distracted from the fact that she was actually a GRU spy and suggests that any attempts to claim that McCarthy "was right" suffer from the Texas Sharpshooter Fallacy: a man shoots wildly into the side of a barn, draws a target around the bulletholes, and then says "look at my deadly aim!"