There are no human emotions which are always bad. Every emotion is useful in certain circumstances. Emotions are bad when they provide incorrect guidance or they hijack you.(%$# mine)
That said, even an emotion like hate has utility, if it’s correctly pointed. People like the person below have a problem.
Hate exists to tell you when someone is a threat, and you should do something about it. It often is hijacked, as with Americans thinking that foreign leaders like Putin are the primary threat, when it’s their own leaders who kill and impoverish them. When hate operates correctly, it points at actual threats.
Trump’s actually dangerous to a lot of people, and hating him is an appropriate emotion. Being consumed by it isn’t, but wishing that Trump would die of natural causes is entirely reasonable. (Granted, Pence might be worse, but you can hate him too.)
Emotions have purposes. Hate is meant to tell you who is a threat. Anger is meant to tell you that someone is doing something they really shouldn’t be doing. (This is one reason why, in spiritual communities which say one should never be angry, abusers manage to get away with abusing for a long, long time.) Jealousy tells you you’re falling behind and not living up to your potential.
Anyway, the main problem with hate and anger is that they are easily hijacked and hook onto targets who aren’t actually dangerous, but merely “foreign.” As with the companion feeling of loyalty, most of modern “leadership” is hijacking tribal emotions and pointing them in the wrong direction. Loyalty to Biden or Trump (both evil men who have done, and will do, horrible things) is insane unless you’re directly part of the gravy train.
We humans have very badly f%$#ed up our emotional guidance systems. They’re supposed to point you towards what’s good for you and warn you about what’s bad for you. Trump is bad for almost everyone, and so is Biden. So are most Democratic and Republican politicians, almost all CEOs of major companies, and so on and so forth.
So go ahead and hate them, just don’t let it be chronic or hijack your ability to make decisions. It’s definitely appropriate.
The people who are dangerous to you and who have, over 40 years, impoverished Americans, are your own leaders. Hate threats, they are a threat.
People who say that you should not hate are wrong.
You should watch yourself and make sure that your hate does not make you stupid.