I lived through all of that. It was not continuous like it is now. It was intermittent. If the media had not been ginning them up for the temporal equivalent of "page views" they wouldn't have happened at all. Now "the people" can generate them on their own. (The media still runs along behind fanning the flames, but they're working to keep up rather than leading it now.) There has been a fundamental change in how they work now.
That’s essentially the same argument which was levied against the Gutenberg press, and the home telephone, the crossbow, and virtually all significant advances which served to empower more people at the expense of hierarchy.
I don't think jerf is saying that the increased prevalence of witch hunts is an argument levied against the internet. I'm pretty sure jerf is an enthusiastic supporter of the internet. Nonetheless, the increased prevalence of witch hunts which is enabled by the internet is lamentable and worth addressing.