The response to potentially heavy, controversial topics should not be avoiding the discussion, nay, not even avoiding, but forbidding it. Surely we're all adult

The response to potentially heavy, controversial topics should not be avoiding the discussion, nay, not even avoiding, but forbidding it. Surely we're all adults and we can engage with the arguments presented, and in the process learn something. And if the discussion becomes heated, then it becomes heated. Then some hours pass and we move on. Having a couple of people saying: No, this should not be discussed is dystopic and illiberal.