Why would they have to take a stand? Ah because other people would make them take a stand. Why would these other people make the first group of people take a stand? Because they care. What if they don't care? Somebody else should pressure them into caring so they can pressure the ones who can do something about it. Etc etc

My point is that this is what it's usually meant by "we are not doing anything about it". It generally means that there is not enough collective awareness about an issue for the people involved to have enough incentives to do the right thing.

Some people observe that the issue is under somebody else's direct responsibility but draw the conclusion that the responsibility chain ends there.

Other people instead think it's their responsibility to apply some sort of pressure from outside and failure to even attempt to do so extends the responsibility of the inaction to them too.

Some of those people extend their feeling of responsibility to also shame people for not shaming other people.

This is all natural and human and as with all human things it functions well until it fails catastrophically