Many people seem to feel otherwise, and there are laws in place in various regions as a result. Are they wrong to choose to restrict your speech in favor of the collective good? If not, then what is the dividing line between "verbal abuse is okay" and "verbal abuse is not okay"? If it merely drives them to self-harm rather than suicide, is that morally acceptable, in some way that causing suicide is not?
Societies have a long-standing tradition of restricting individual behaviors for the collective good. Wishing that societies wouldn't this is hopeless, because it seems like every society that doesn't restrict individual behaviors to some degree ends up becoming a textbook example of how not run a society.
I read your moral position here as "if you are too frail to resist someone's words, you don't deserve protection from their verbal abuse with malicious intent". If I have misunderstood how your moral reasoning applies to the topic under discussion — trolls willfully causing psychological harm on the Internet — please help me understand where I've misapplied your logic.