1. The Optimist. Believes they live in "the best of all worlds" and everything always works out for the best--Voltare satirizes this idealism in Candide.
2. The Broken Nihilist. Believes everything is bull shit. Everyone is a liar, civilization is a scam, and all human interaction is a power struggle.
The optimist doesn't feel the need to worry about anything because they believe some magic force will make everything right for them. They thus are more susceptible to deception because they believe there can be no bad consequences of their actions...they are living a magical life in the best of all worlds...nothing can go wrong.
The nihilist, as we may suspect, is naturally immune to deception within the bounds of his reasoning capacity. This gives him an advantage over the optimist...and he always looks down upon the optimist as an idiot.