Anything taken to the extreme is probably going to break down, but that doesn't mean a less-extreme version is per se incorrect or bad. As with all things, it's about balance.
But as they are taken to the extreme, they have to change to reflect that shift and remain coherent. As the snowflakes move to the left, for example, they have to jettison the traditional liberal views on free speech. Even if they didn't mix with non-liberal traditions as they grow closer to them, they still end up disconnected from liberalism. They stop being simply an extreme, and become a discrete new thing to contend with. It is a challenge, they aren't coming from the same place anymore, and reevaluation would help to understand how to effectively tackle those differences.
I took what you said to mean that you were criticizing the author of the story for being unwilling to re-evaluate his own liberalism?
So, uh, speaking of re-evaluation: I was day drinking, and Post Naptime me is very sorry for wasting your time. That is was what I was saying, but in this new post nap world I don't really think that corresponds to what the author was saying. :( sorry