Eh, shame (or rather, guilt) is a healthy emotion when you do something harmful and don't make amends for it. It's an emotion that's meant to motivate the person feeling it to do better, athough it can be hijacked by social pressure to make people feel shame when they've done nothing wrong, which is worth watching out for (especially common around sex).

If I steal from a friend, I should feel guilt/shame because I did something hurtful to my friend. Someone running a dog fighting ring should be ashamed of themselves for perpetuating and profitting off violence. Someone contributing to animal agriculture should be ashamed of themselves for supporting violence and exploitation and abuse because it's convenient and gives them pleasure. I feel ashamed of using fossil fuels and water inefficiently, among other things, but that helps motivate me to try to change.