There's a cottage industry of throwing rhetorical bombs and trolling 4chan in order to get threats. The people complaining the loudest about threats are reluctant to actually get the police involved, and they never stop trolling because they realize the threats aren't real.
tldr: Internet threats are no reason to even consider curtailing free speech.
"You will be judged by the company you keep" is starting to bite these platforms, and they're trying to do something about it.
Yes we do. If you self-censor because you are afraid of the consequences of your speech, that makes you a coward. Far better for cowards to cower in fear silently then for everyone to be forcibly silenced to placate cowardice.
Because banning death threats is forcibly silencing people?
Please tell me I'll reading that wrong.
You answered your own question. Its already a crime to make death threats. If you are afraid to speak your mind or otherwise do what you think is right because you are afraid of the consequences, whether they be crimes or not, you are a coward.
If tons of people are self-censoring or avoiding speaking at all for fear of being doxxed and getting death or rape threats, do we really have free speech?