Final answer:
Senator McCarthy can be considered the main reason for generating media's intolerance to 'sympathizers' through television due to his aggressive tactics and unsubstantiated accusations during the Cold War period.
Step-by-step explanation:
Senator Joseph McCarthy can be considered as the main reason for generating the media's intolerance to apparent 'sympathizers' through television due to his tactics and accusations during the Cold War period.
McCarthy gained fame by accusing government officials and Hollywood professionals of being Communists without providing substantial evidence.
His aggressive behavior and unsubstantiated accusations were televised, leading to a nationwide backlash against him and creating an atmosphere of intolerance towards anyone perceived as sympathetic to Communist ideologies.