No, it's human nature. You have to ignore the remote possibilities, or you start to isolate yourself from others. Humans are a social species- even a few months in solitary can have major psychological effects. And when you fear everyone, you're basically (a) putting your self into a solitary condition, and (b) reenforcing the native paranoia that comes from having evolved from a four foot tall primate that ate a smaller number of species than it was eaten by.
Basically, you make yourself crazy. A lot of us probably are borderline, either to paranoid, or to obsessive-compulsive.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.