Firstly, to state the — I hope — obvious, there is no justification for the abuse you describe. No ifs or buts. So I hope what I want to add below is not an unacceptable “but…”.
You are right to quote the ENEMIES OF THE PEOPLE’ and ‘CRUSH THE SABOTEURS!’ headlines where “those who dissent are portrayed as actual traitors.” However, on twitter, when I suggested a headline to an article you wrote “BBC RIGHTWING BIAS IS A THREAT TO DEMOCRACY”, is also hyperbole that creates a climate for the sort of abuse Laura Kuenssberg faced, it was justified as “critiquing media bias not being incitement of violence”. I’m afraid I don’t think the examples are that far apart.