Not necessarily.
I think that for one to be happy they need a healthy brain, a good life(or at least a one they're content with), and some mental resistance towards the suffering in the world.
It's not evil not to pay attention to the suffering in the world. It might sound selfish, but if one can do nothing about it then it's really evil of them.
In fact, I support not spending too much time thinking about the suffering in the world. It only eats you alive and you'll probably end up not being able to change anything anyways.