[ams6110]

There's enormous evidence for a lot of things, but that doesn't mean it's equally applicable to every individual. I see no reason to think that some small percentage of people truly are happier alone even if the opposite is true for the large majority.

[aoeu345]

But the human brain is mostly dedicated to socializing and interpreting social signals. If you don't even stretch out those parts of your brain, you're not even satisfying intrinsic human needs.