Avi, not to weigh in on a machlokes between goyim who you see as authorities on matters of hashkofa..
Rashi says chesed shel emes by burying the deceased is so called because “aino metzapeh leteshlum gevul”, he does not expect recompense. That’s my definition.
Chasidishe rebbes used to give a poor person tzedaka multiple times, because the first time it’s to alleviate tzaar that you feel, abd then afterwards eventually it’s totally lishma.
When I’m talking altruism, I’m discussing chessed lishma, for the sake of helping others. Not because of promoting peace between goyim and us, and not because the goy will help you in the future, or other ulterior motives