Why was McCarthyism popular for so long?

McCarthyism gained popularity due to a combination of post-World War II fears of communism, the Cold War climate, and the desire for national security in the United States. Senator Joseph McCarthy exploited these fears by accusing numerous individuals in government, entertainment, and other sectors of being communists or communist sympathizers, fostering a culture of suspicion. The media coverage and public anxiety surrounding the threat of communism contributed to its endurance, as many people believed that rooting out alleged subversives was essential for protecting American values and democracy. Ultimately, it took time for the excesses of McCarthyism, including its reliance on unfounded accusations, to be widely recognized and criticized.