[dragonwriter]

> For example, I frequently hear liberals say that if libertarianism were pushed to its logical extreme, you'd end up with Somalia.

I only ever see that in discussions where libertarian participants attack every criticism drawn from real-world experience with "but, that's only because of government, but in a real libertarian system, that wouldn't happen".

> For some reason, liberals are insulated from the question on what happens when leftist ideology it pushed to its extreme.

Except in the real world, where conservative arguments often start with some caricature of what leftist ideology pushed to an extreme would be presented as exactly what everyone even mildly to the left of them actually wants, at a minimum, and immediately. (And, yes, the reverse happens from liberals to conservatives frequently, too.)