What is the source for our morals?

[robvalue]

The simplest answer is indeed evolution, in my opinion.

Some species works best in cooperation, and so natural selection favours those who are more inclined to care about the group and not just themselves. Fast forward huge numbers of generations, and the average gets moved towards generally empathetic animals.

Of course upbringing and environment affect us individually, but when animals are being raised by generally empathetic animals, that's what they'll get on the whole. And naturally there are exceptions all over the place, because a species is not a monolith but a huge variety.

I believe there have been big differences found in the brain between people with empathy and those without (such as socio/psychopaths).

https://www.youtube.com/watch?v=B0HMhP4t3as

PS: Yes, I agree, objective morality is a nonsensical concept in my opinion. You'll find some here that disagree though