The Good & The Bad
Don't be so bothered about the evil Ones.
The world is made up of good and bad people. The more the good people we have, the more the evil ones.
If you get your self busy thinking about the bad ones, you are wasting your precious time you should have invested on something profitable for your carrier.
As these exists in human, it also applies to other activities of life. No matter how long you have enjoyed positive things, a day will come that bad thing or negative things will as well pay you a visit. Don't get overwhelmed or overshadowed with the worries of bad things. The of any good thing that has happened to you in the past and then move on.