Intelligence is the ability to learn, understand, and make judgments or have opinions that are based on reason.
This is an emotionally cold matter. The more intelligent you are, the less emotional warmth you feel. Everything has two sides. The more you know, the less things are just good. Everything has a downside.
This makes you sad and depressed.
Then you start neglecting the negatives. You start saying things like: “Yes, there are bad people on this planet. But I feel bad assuming they were all around me. I just assume nice people and rather do I get disappointed than shutting my natural openness down.”
But there is also a lazyness to it. If I trust everyone, I don’t have to think myself.