Generally on the Internet you would make use of existing tools to prevent people from talking to you if you find them hurtful. For example, I could just block you and not deal with you any more. Sometimes people get around those to harass others. That is definitely bad and we already have laws against harassment and ways for law enforcement to find those individuals without creating a full police state on the Internet. Posting your opinion once is not harassment, no matter how much it makes me want to puke. Or as we used to say in a more civilised time, I abhor your speech, but I will fight to the death for your right to speak it.
I don't know where you got your conclusion from - I am European and I don't mind violent speech. In fact I think we generally need a lot more freedom since many countries give their citizens barely more freedom than serfs had. School shootings have been a perennial favourite for your type to parade around so you can rule over a disarmed population, but e.g. Czechia lets you have a gun at home as easily as the USA and they do not have that problem. USA's problem is mostly societal.
Your opinion sounds like it was formed in the ivory tower of university with no connection with reality. Please get more varied life experience and reconsider your position.