I think a positive step can also be to think back and reflect a bit. Why did I react the way I did? When I first heard the hypothetical, it made me feel bad about myself. After that came a feeling of defeat. I was thinking "why even bother, whatever I do I'm the villain." I'm very afraid of bears, which may have played into this.
The main thing I've been thinking since then is that I find it easier to have empathy with people who show empathy to me. It's easy to think "well then, when they start showing empathy, so will I.", but it goes both ways, doesn't it? That made me want to influence this loop of causality, or what to call it.
I'll set my negative emotions to the side, and try to not contribute to the division between people. Maybe even manage to be a part in the positive direction. As I get older, the more I realize that I can't change the world, but I have a very deep wish to be a net positive somehow.
As for acting on the things I have learned, I don't really know what to do, and I hope this is a safe space for anyone who needs support.