[ekianjo]

Being kind is a cultural trait that we have been selected for, over generations, to increase our chances of survival and also ROI. There is nothing gratuitous about it once you understand where humans come from.

[the_af]

Yet many humans still choose to be unkind, rude or obnoxious.

So I'll pick the kind ones, regardless.

[WalterBright]

Older people tend to be nice, as decades of experience teaches them that being obnoxious doesn't work.