Who happen to share the same ideology, tactics, etc. etc. etc.

Yes! You'll notice that there are numerous different terrorist groups out in the Middle East, for example, that share similar ideology and tactics. That aren't cells of the same larger group, but are completely discrete and independent organizations - that in fact are sometimes bitter enemies of each other. They're using the same "playbook," because there's a common set of strategies and tactics that are effective within the resources of these types of groups. But that in no way means they're part of some larger group.

To give you yet another analogy, go into a major metro and look at all the various street gangs that are there - and you'll find that they tend to have a lot of similarities. They'll share the same general goals, the same general organizational structure, the same tactics. They're not at all "cells" of some larger uber-Street Gang - in fact, they often are very much antagonistic towards each other. They end up mimicking each other and converging on many of the same features anyway.

Now you're just lurching into being insulting. I've humored several threads' worth of this plus cheap debate tricks from you; that's done now.

It's not insulting. You're taking two positions that are inconsistent with each other. On the one hand, you're claiming that these various Antifa groups are "cells" of something, that they're analogous to the cell structure that other larger organizations (like the IRA, or as I have mentioned al-Qaeda) sometimes use. On the other hand, you're acknowledging that there isn't a larger organization, and that there isn't the Antifa version of a Kevin McKenna or Osama bin Laden or Bakr al-Bagdadi.

Those are incoherent positions. It sounds like it's very frustrating for you, but it's this very inconsistency that made Trump's mis-statement on this point a mis-statement. You can designate the IRA a terrorist organization, but you can't designate Irish Republicanism as a terrorist organization - and if one tries to do the latter, it will reveal a serious lack of comprehension about what Irish Republicanism and the IRA actually are. The latter is an organization, and the former is an idea.