Your inability (or, more likely, refusal) to distinguish between valid criticism of ideas and abuse, harassment and threats is a fine example of a core problem of online dialog.
abuse, harassment and threats targeted at people are illegal. I agree that they're unacceptable.
Ideas have no such legal protection, for good reason. If they are stupid or poorly presented, they can be dunked on for cool points. This is one kind of activity people enjoy doing and spectating on public forums, and it's a net positive to society.
> I want experts to be able to talk about their work without feeling abused, harassed, or threatened
> Should someone feel they have to self-censor just to avoid this?
You keep mentioning feelings. This is what I'm responding to. I get the impression that you want the law to step in and silence other people when you feel bad. In public, such an arrangement is stupid. Conversely, it can be beneficial in private spaces where participants consent to community guidelines, formal or informal, at the outset.
If we agree that policing public speech based solely on what people feel is a bad policy, then this whole conversation has been sound and fury, signifying nothing.
And if we disagree, all I can leave you with is this: what if whatever harmless, perfectly legal thing you say makes somebody else feel bad? Should you be silenced?