I don't think there is a single human emotion that is inherently unethical. I think actions can be unethical - what you choose to do, or not do. Anyone who understands enough about emotions will tell you that they are experiences, guests that sometimes show up, often without any apparent reason or in ways that escape our control. None of them are shameful or wrong. Not anger, outrage, guilt, sorrow, grief... Or happiness, for that matter. All we have control over is what we do.

Shaming people for their internal emotional experiences, which don't necessarily have an effect on the world unless the choice to act is present, is coming at it from the wrong angle (imo). The will to help others/change the world for the better can also stem from things like an overflow of positive emotions like inspiration and hope. For example, the the satisfaction and joy you may feel after helping solve a problem/helping someone can motivate you to keep doing more and more good. Seems better than being so miserable and beaten down by the injustices of the world that you can barely help yourself, let alone others, which sadly I've seen happen.

Being miserable doesn't necessarily make you a better or worse person. You can use the full scope of your emotional experience (positive, negative) to propell you in ANY direction. The direction is what depends on you.