I think, we all go through such phases and the trick is not to think too much. I am sure you must be reading about al the gory news or hearing about it when you were young, and would have felt bad and sorry. But now you are letting your mind getting affected by it. I am not saying close your mind, of course do your bit to make world a better place to live in but do not let the bad fact your happiness. In fact make your happy state infectious.
I know it is difficult but I am sure when you get the gory things so easily, then you will be able to get the happy bit even more easily.
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