A simple example: with picture editing software people have been able to create believable fake content for a long time, it did require skill which limited the scale, with genAI creating in seconds, by anyone, a much more plausible fake image than most people were able to before creates a whole other kind of problem that didn't exist before.
It's a tired argument to reduce issues to analogous which existed before and discard how the scale and degree of it changes the class of problem...