> Why would you actively choose a position that would be considered anti-social instead of a position that would be considered pro-social if they have the same objective grounding?

This simplifies away some crucial details about the actual situation.

For example, I have limited time and opportunities. Spending 200 hours making a piece of software more handicap-friendly may mean 200 hours less of being a good parent to my kids. Or working at a homeless shelter.

We can probably agree that all 3 activities are "pro social" in some manner. But I can't tackle all of them. Part of growing up is accepting that you can't do everything.

I'm open to changing my priorities, but not without good justification.