At the same time, how common are the people who actually put stuff like this on signs, obscure tweet or tumblr post, or random decision made by 3 members of an obscure college campus group?
Is the problem random pockets of people with fringe opinions, or is it the rest of us getting an ideological erection going when we see proof that there are people out there who lack the foresight and reasonable perspectives we do?
I kind of wonder who actually does more harm, the one woman who carries a sign somewhat unreasonably putting allies on blast for being in the same demographic as enemies... or the 100,000 people who angrily retweet it, who call into NPR shows about it, and unintentionally assist the right in creating the image that the left is nothing but a series of arbitrary purity tests and infighting.
That's how they took down Occupy (I bet many of you cringe at the very mention of that word; for a few weeks it was just as energizing as this women's march).
Some of that does indeed land on the protesters themselves; they knew how to organize but not how to leap towards the next step to gain real power the way the Tea Partiers did. But the other half of that was, the media and liberal allies joined conservatives in painting an incredibly false, intentional image that even though these protests had a primary purpose alluded to right in the name ("Occupy Wall Street", very obviously referring to deregulation and subsequent corporate welfare from the government), they were actually a meaningless hodgepodge of nothing, absolutely unlike the Great Baby Boomer Protests of the 70's (even when many were larger and more persistent than those).
I guess just think about where the real harm to having some kind of cohesive leftist movement actually comes from. Carrying fringe elements on our collective shoulders, pointing to them and saying, "look at these idiots! I'm better than this!" probably isn't doing much good.