For this Troper,it was a realization that hit him randomly,when he was younger.The day this troper realized that every person is similar to a character in a play.Everyone plays their part,and that even when they think they are different,they are still similar.The worst was,when he realized how most people believed in the word: "Deserve."By believing that someone deserved pain for an action that was caused to them,the person was able to cause harm to others with very little regret or care for the pain they inflicted.Cue this troper becoming paranoid,to the point to where he mapped out plans ahead of time,depending on the circumstances.He started to sleep with a box cutter under his pillar,hang curtains up so no one would spy on him when he's asleep,and even taught himself to wake up the moment someone managed to open his door after he locked it.Why?"Because sometimes dangerous people live in your house,or could be family members.It got to the point,where when he went to a supposed scary Halloween store,his friends found out that nothing there scared him.They asked what scared him,and this troper replied calmly."
People scare me..Normal People scare me the most." Ironically,unlike most of the other examples,he didn't become pessimistic.He is still as helpful as ever,and willing to help anyone.
Just don't be surprised if he happens to have come up with a plan on how to fight you beforehand,just in case things don't work out too well on the SlidingScaleOfIdealismVersusCynicism and you attack him.