Happinesss?

"i wish everyone to be happy"
Though it is never possible to happen. You see, a certain kind of people are happy by the others pain and sadness.
And it is not possible to change their way of getting happy either, so everyone can realise that a wish like that is, at least, not the most realistic.
So the half of the people living in a community must be sad to make the other half happy.
Feel free to review about my opinion on this subject.