RATIONAL SURVIVALISM: It certainly makes sense to prepare for possible future disasters so as to best mitigate the potential effects on one's health and survival, and there are certainly real near future threats which I discuss elsewhere on this website, but this should be reason rather than paranoia based. It always amuses me to see self styled survivalists going to great effort and expense to prepare for all sorts of low likelihood events without first correcting their often incredibly unhealthy personal lifestyles from which they are probably much more like to succumb. Stocking up on guns, ammo, and underground bunkers when they could increase their survival chances much more simply by eating a healthy diet, not drinking heavily or smoking, and not engaging in hostile confrontations with the powers that be. That's not real survivalism. Real survivalism is acting so as to maximize one's health and extend one's longevity in the face of all potential dangers, rather than just the threat of black helicopters landing invading UN troops! It's highly probable that most of typical survivalists will succumb to their own stupid life choices long before they have to use their guns or bunkers!
There is no question that there is plenty of irrationality and intolerance among the survivalist community. I was actually kicked off a couple of survivalist discussion groups simply for suggesting heresies such as these.