I know several people who are borderline. Some I know or have known quite closely. I don’t think it’s fair to characterize their contribution to harmful internet behavior as disproportionate without also quantifying their proportion of internet behavior (it’s small).

And I definitely don’t think it’s fair to qualitatively describe the relative level of bad internet behavior of people with mental illness based on the behavior of people with personality disorders, which is just a subset of mental illness.

Edit: and not all people with personality disorders just go around the world/internet acting harmfully.