How about I wish that two of my coworkers would drop dead?
Is there any reason that you want them to die?
They do stupid things all the time and mess everything up, I'm so sick of them.
There's nothing wrong with sometimes fantasizing about terrible things happening to people you dislike, but it shouldn't be something that you do all of the time or speak about with others. There's enough negativity in this world to the point where you should want good things to happen to others and not bad. It's also pretty extreme to be hoping that they die of all things, and if it really does happen then you will probably feel extremely guilty.
So I shouldn't even think about hurting anyone?
No, you shouldn't want to hurt them yourselves or imagine you doing the actions but sometimes it can be healthy to imagine bad things happening to people you dislike. Sometimes that sort of thing can be cathartic, in a way. As long as you don't actually get happy if those bad things do happen, or else people will believe that you lack basic humanity.