I think actually discussing and debating things is precisely how you get an informed society. We only need be concerned when people 'begin by denouncing all argument, or forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments with force.' That certainly doesn't seem to be the case with RFK, to say the least.
Your comment reminds me of a joke from the Soviet Union: "This is Armenian Radio; our listeners asked us: Was it possible to criticize Hitler? We’re answering: Sure. The same way as you criticized Stalin. You had to lock yourself in your bedroom, hide under two, or better three covers, place a pillow, or better two pillows on top of the blankets over your head, and then whisper whatever your soul wishes about the dictator, strictly adhering to a five-minute limit." [1]
The USSR had constitutionally enshrined freedom of speech: "Article 50. In accordance with the interests of the people and in order to strengthen and develop the socialist system, citizens of the USSR are guaranteed freedom of speech, of the press, and of assembly, meetings, street processions and demonstrations." [2] But there are rights, and then there is ability to exercise those rights.
[1] - https://johndclare.net/Russ12_Jokes.htm
[2] - https://www.departments.bucknell.edu/russian/const/77cons02....