> I almost agree. But there seems to be speech that should be forbidden, like threats of physical violence.

I would not ban that either. However, if you decide to make a serious threat, which takes a significant amount of energy, like doxxing and calling me on my phone to tell me you will kill me, you will have to live with the consequences of the legal system.

If you just tell me in HN comments that you will kill me and my family, I would certainly not give a damn because that's low effort.