This post doesn't have much that addresses the "expanding circle" case for empathy, which goes something like this:

Empathy is a powerful tool for honing in on what matters in the world. By default, people tend to use it too narrowly. We can see that in many of the great moral failings of the past (like those mentioned here) which involved people failing to register some others as an appropriate target of empathy, or doing a lousy job of empathizing which involved making up stories more than really putting oneself in their shoes, or actively working to block empathy by dehumanizing them and evoking disgust, fear, or other emotions. But over time there has been moral progress as societies have expanded the circle of who people habitually feel empathy for, and developed norms and institutions to reflect their membership in that circle of concern. And it is possible to do better than your societal default if you cultivate your empathy, including the ability to notice the blind spots where you could be empathizing but are not (and the ability to then direct some empathy towards those spots). This could include people who are far away or across some boundary, people in an outgroup who you might feel antagonistic towards, people who have been accused of some misdeed, people and nonhumans that are very different from you, those who are not salient to you at the moment, those who don't exist yet, those who are only indirectly affected by your actions, etc.