It is not useful to blot out that which is not good in the world.
It is not useful to dwell upon it either.
It is useful to be aware of it so as to be on one's guard against being negatively influenced by it.

Focus on what is good while being aware of what isn't so good is my recommendation.

The more you laugh the longer you'll live.
So 'tis not useful to take anything - especially ourselves - too seriously.

It doesn't matter how you feel - so long as the way you feel is by your own choice.
That is, never allow others to decide how you feel.
F'rinstance - if someone at work is making you feel angry - don't allow them to do so. Choose not to be angry and you won't feel angry.

We are all free to choose - every step of the way - no exceptions...