You can criticize someone's ideas all you want, but dogpiling a single person based on their gender identity in the way that KF did is not that. It is cyberbullying and it's lethal and the people involved should be fined or locked up in prison for engaging in behavior that had a non-trivial probability of causing another person's suicide.
I would say the same about people dogpiling someone online about their physical appearance or ethnicity. It should be moderated out of existence, and if that doesn't work it should be illegal.
If you throw bricks off a building, I similarly want you locked up for the same reason. You probably won't kill someone, but the causal connection is such and the probability is sufficiently high that we lock people like you up, because you're a menace and direct threat to your fellow humans.
Of course, I'd want the punishment for throwing the brick to be larger, I am not throwing proportionality out the window.