Actually, think very hard about what you're proposing. OK, let's propose a humanity where there is
absolutely no group cohesion whatsoever. What's the result?
It certainly doesn't look much like the world you're familiar with.
If you look around, there are plenty of species that work that way. You really shouldn't have to imagine that hard.
I often amuse myself when the recurring gender debate (or other similar debates) come up on HN by trying to convince participants to first concretely describe the world they are actually trying to produce before they go too far off into la-la land making wild prescriptions about what needs to happen. This is another example of that sort of thing. Are you sure you want to produce a world in which nobody, ever, for any reason, has any sort of preference for one person over another and gives any sort of preferential treatment as a result? If you really think about it, probably not. Trying to take the ultimate hard line on "no discrimination" isn't a sound solution. It is neither logically nor socially viable. The method has become mistaken for the cause itself, the direction for the destination.