[antepodius]

If you're always agreeable and self-sacrificing, you'll be taken advantage of by malicious actors. And it's not always easy to figure out whether the other person is actively trying to take advantage of you or not.

[arcticbull]

Nah, that's prisoner's dilema at work.

[antepodius]

And some people chronically defect, hence why tit-for-tat works.