You look different from me therefore you BAD and EVIL. You acceptable target for hurting because my group said so. Even though you never hurt me.

No offense, but I've always thought that's a terribly limited way of looking at tribalism, particularly as seen through the lens of civilisation. Yes, I don't argue against that take, but tribalism from a different POV generally means people accepting (and needing) everyone in their tribe in order best survive. It also means a much closer relationship with the local land, flora and fauna, doesn't included huge financial and religious institutions that routinely make most peoples' lives miserable, and is a state of being that can pretty much survive endlessly. Compared for example to our modern, high-tech civ which is pretty much destroying itself before our eyes, with disastrous impending results for most living species left on earth. Yes, we live longer due to modern medicine and such, but it also seems to me that we're likely more worried, stressed, and plain unhappier than when living in our natural state, on the whole.

So yeah, every human state of being has its cons, but tribalism on the whole seemed to work best, arguably existing for millions of years before the total clusterfluff we have now.