Tolerancia extrema es peligrosa

If you think human beings are always rational, it becomes impossible to explain at least half of history.
The ancient Greeks understood that carrying any principle to extremes was dangerous. Yet, thousands of years later, some Western nations take tolerance to the extreme of tolerating intolerance among immigrants to their own societies.
Some even make it illegal — a "hate crime" — to warn against intolerant foreigners who would like nothing better than to slit the throats of their hosts, but who will settle for planting a few bombs here and there.