A Kafkatrap is defined as using denial as evidence of guilt, it was coined by Eric S. Raymond in 2010 in reference to the book Der Proceß by the term's namesake Bohemian author Franz Kafka.
The regressive left frequently exhibit this behavior by slandering people as racist/sexist/whatever for violating their extremist ideology, with the only legitimate defense to these allegations being to out the source as extremist with the origins of the allegations being the accusers ideology and definitions rather than objective facts, which is something that would not be accepted by the regressive left as they consider all criticism of their deluded extremist ideology illegitimate and thus rooted in whatever is relevant in their retarded arguments.
As their behavior often fits the definition of a serial harasser, the only way to make the shitheads stop is to call them out publicly and spread the word about their terrorist ideology to everyone so that they can avoid and ignore them for their shitty behavior. I also recommend any site that's hostile to the regressive left take measures to fight the freaks by banning them on sight for harassment and stalking, hate speech, and the promotion of terrorist ideologies and conspiracy theories.
It's not shortsighted so much as following the proper advance of escalation and shoring up your community cohesion. Almost nobody goes from 0 to 100 right away and you don't want to start anything whilst half your guys are still scratching their asses thinking they were just going to talk things out.
The shortsightedness was not responding in kind like that years ago when they started doing exactly what was described. So you didn't end up with the situation where most of the guys against you have been uncontestedly larping about killing you for years.