[badminton1]

Because if altruism didn't exist, if you only received things in exchange for something, your life would be very, very different.

And if you appreciate that, you will at some moment give back. Not necessarily in the form of money.

Altruism does not need a religion. It also exists in the animal world.

[loki49152]

Altruism doesn't mean "cooperation" or "getting along with others". It's a specific moral philosophy invented and named by Auguste Comte. The actual philosophy is horrific and has nothing at all to do with benevolence toward anyone.