They’re a bigger problem because there are more of them and they’re easier to get. Which isn’t a metric that applies here. Analogies seldom map on every metric, they’re a tool for exemplification. In this case it’s like anyone having equal access to either a handgun or machine gun.
Even if the analogy were wrong, that wouldn’t make the point invalid. I know the point I’m making (and presumably so do you). Again, the analogy is for exemplification, it does not alter the original problem.
I don't think shitposts are the same thing as bullets, and choosing machineguns/hanguns as your analogy is a poor exemplification considering you could have instead have chosen an IMO more apt fax machines/email analaogy while making the same underlying point of "...much faster rate and higher accuracy than before..."
Yes, spam is worse with email, but we're still in a better place overall than before in my opinion.
Even if the analogy were wrong, that wouldn’t make the point invalid. I know the point I’m making (and presumably so do you). Again, the analogy is for exemplification, it does not alter the original problem.