Some people only seem to find happiness-- or something they mistake for happiness-- by making others miserable or at least by seeing others in misery. They enjoy seeing others suffer, but can't share in the joy or successes of others. That's sad.
I've never understood those people, and I've known too many over the years.
Now, I don't want to see someone find happiness through harming others, but otherwise... be happy with whatever you can.
I like for people to have nice things happen to them-- as long as it doesn't come at the expense of others.
And if it does come at the expense of others...
Since I'm not a fan of punishment/revenge I'm not really interested in seeing those who enjoy hurting others suffer. Unless that's what it takes to make them stop. If their actions lead to their suffering-- they spun the wheel and won the prize. That's why I don't care when a cop shoots and kills an actual bad guy in the act, nor when a cop is shot and killed while enforcing unethical legislation. They both knew what they were getting into. It was a choice.
Not caring isn't the same as making me happy, though. I'd be happier if people didn't choose to be thugs or scum. If they'd choose a voluntary life, I'd love to see it work out and make them happy. I want more happy people in the world. There's no way that wouldn't be better for everyone.