Respectfully, there are very few women who kill their children who are in active treatment for post partum mental health issues. I would challeneg you to find another story like this. That’s a big part of the sympathy- that we as a society dont give enough attention to pp mh, and that even when a woman did give it attention, this happened.

You can blame all the other factors class/race/gender- they are clearly relevant. The idea of someone being aware of, and taking advantage of, help in this situation, and then tragically having the worst outcome is part of what makes so many people have sympathy. Among the other reasons you’ve mentioned