Each and every being has an enemy, a foe, a predator.

 And that enemy could be anybody anywhere.  

It might be the one(s) who the closest to you that are supposed to love and protect you. Instead they devalue you, beat you up, stand in your way, eliminate all of your friends, family members and social life. This seems to be quite common in the world. 

Some of these people end up killing their "loved ones". For what? Control or rather, the desire to control and inability to do so. Or they might kill just for the fun of it because they are a psycho sociopath whatever medical name you want to call it. Some derive pleasure from inflicting pain upon others and there is not a damn thing you can do to stop them. 

An enemy could be a total stranger, a neighbor, an associate, a co worker, a boss or a "friend".  It could be virtually anyone. 

Whoever you are, wherever you live you won't rest assured that you do have at least one enemy even if you never find out about it, never know who they are. 

You can be the nicest sweetest pie of a person to everyone and someone out there hates your guts and seeks revenge upon your life, desiring to destroy it and make you miserable or dead.