My wife and I chose to work and live a middle-class life. My adult daughter blames her mother and me for her psychological problems because we raised her in a integrated but racist society in the 90s in which white children taunted her as a child. She says we had it easier because when we were children we were in a Jim Crow society that surrounded us with black people.I would say that it is a very common situation where someone expects an apology and the other party sees no reason to apologize because they feel they did nothing wrong. A reasonable subset of those cases will fall into the category the OP describes, where the other party says to themselves, "I did everything I could and therefore I couldn't have done anything wrong." In most of these situations there will be a disagreement about whether the other party did in fact do everything in their power to prevent the unfortunate event.
There are semantic problems even in this phrasing. If you do everything right, can you fail? Is it possible that one not be responsible for their own failing?
I think the crux of these situations is the fact that we never know whether we did everything right. So if someone expects an apology because they don't think you did everything right, and you don't think it is appropriate to apologize because you think you did everything right, then it is still possible to offer a quasi-apology given the fact that you might be wrong and you might not have done everything right. An approximation might be, "I'm sorry this happened, and even though I tried to prevent it I will reflect on what more I might have done." More than that would require an argument about what in fact you should have done that you did not do, and that argument could be very productive.
Often it is reversed where someone blames themselves for what they could not prevent, and others try to convince them that it is not their fault.
Was that our fault? Was that our error? Was that our wrong action? We can certainly regret the turmoil that she suffered because of the way America was set up, but do we have anything to apologize for in our own actions?