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[–] 24245081? 0 points 3 points (+3|-0) ago 

Because a lot of people haven't come up with their own foundational beliefs. Quite a few people have had their beliefs created for them, so when they come under any type of scrutiny, the foundation which is made of sand, crumbles quickly.

When you come to a conclusion yourself, it's very easy to defend your beliefs, because they are yours, you came up with them.