"Hate" is probably too strong a word to assign to these effects of oxytocin on human preference between in-group versus out-group members.
Edit: Actually this is interesting as regards 'attachment as a cause of unnecessary suffering' philosophic frame. — Nils Loc
What about if we can't make a clean cut between good and bad, presuming that they're both caused by a single biochemical? — TheMadFool
The article got my back up very early on: "And now researchers have discovered it also can promote ethnocentrism, potentially fueling xenophobia, prejudice and violence."
I doubt it very, very much. There aren't any "ethnocentrism" hormones or neurotransmitters; no chemical to make people prejudiced. There are neurotransmitters, hormones, and other chemicals that are required to express/experience love, lust, hate, generosity, greediness, and so on. The brain can not play tic-tac-toe or add 2+2 without neurotransmitters being on hand.
If people spontaneously spout ethnocentrism or sexism, or whatever, it is probably an instinctual (genetic) trait. Neurotransmitters don't "cause" thoughts as much as they facilitate the processing of thoughts.
It would not be surprising if a hormone or neurotransmitter played contradictory or peculiar roles. I use eyedrops to control intraocular pressure (glaucoma) which is derived from a female hormone. Beats me. If you give a man testosterone to boost circulating male hormone (in hopes of getting buffed faster) it often backfires because if the testicles notice there is enough or more than enough T in the blood, they cut production. Better to let them make it themselves. — Bitter Crank
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