Not really making an argument, just want to speak precisely.

Empathy used to justify or enable harmful actions is toxic. Like, say, people who use at an excuse for retribution, or people who do something harmful to soothe their own empathy, or people who enable another's toxic activities out of empathy.

Empathy and compassion aren't very well-defined, but I have always understood empathy to be about sharing in another's feelings, good or bad. Compassion is a little more distanced, it's about understanding another's feelings and simultaneously being considerate about it.

Empathy can be very powerful, and introduce feelings and emotions into someone who doesn't know how to deal with them well.

BTW I'm not trying to make a case against empathy, not at all. But I think about empathy and compassion a lot, and while I still want to champion them as virtues, they can be just as complex and subtle as any other human experience. I think our lack of nuanced understanding of empathy and compassion is a root cause of a lot of human problems, especially recently.