[internaut]

I think the answer you seek is in front of you. Look at it this way hiou.

There are the Lumpers (everything is the same) and the Splitters (everything is different). If you remember the book Sophie's World (which was full of great insights into this), then it is like the genres of reductionism and holism in philosophy.

The real answer is that people's brains work differently.

If you want some consolation, it is that we cannot live without either group, Lumper or Splitter. Each group has failure modes which can be corrected by the other tribe. I am convinced that is why the left and right exist in all cultures and times. It's a very important human algorithm.