Humans are societal creatures. That avoidance as self-preservation can be considered a weak trait. Society only really works if we know we have each other's backs when the chips are down, so with you abandoning situations when the chips are down demonstrates you won't be there when I need you to be, so it's probably better to cut you out now, right?
Or, why would I put food on the table for the slowest gazelle?
> Society only really works if we know we have each other's backs when the chips are down
I'd disagree with this - capitalism tends to reward defection from this norm, and it's been a stable equilibrium for centuries at this point. You have more of a point when it comes to community, but even many intentional communities are massively hypocritical when it comes to this, with higher-status people having the ability to deviate from norms at will.
helpful reading: https://en.wikipedia.org/wiki/Gemeinschaft_and_Gesellschaft
We live in a post society. We are long past the "we need each other" part. Everybody only cares about themselves and im just reflecting what the world gives me.