There are many cognitive fallacies that humans are susceptible to.

One of the most insidious and difficult to detect is I believe the false dichotomy. I find myself falling for that one even when I am aware of it. Those very good at setting up false dichotomies (conservatives, Tea Party plutocrats, banksters, etc.) are much more likely to persuade folks than those with more nuance (liberals, anarchists, socialists, etc.).

There is no easy way around this though constant vigilance to avoid it is worth it. One must be aware though that other areas may suffer as a result, causing a person to become more likely to suffer other cognitive fallacies since processing power and attention is finite.