Persecution for communist thought is justifiable, in my opinion. Spreading that philosophy could have caused political instability in this country. I view McCarthyism the same way I view Lincoln ignoring the constitution during the civil war- completely necessary when the country is in a crisis.
You miss the point, McCarthy took a problem others were addressing, turned a necessary investigation into what could be called a "witch hunt" based upon his excesses and self-aggrandizement, allowing the left to discredit the investigation and change the the entire perception of the investigations.
mcCarthy was a frick up who harmed america.