Sometimes, whenever you do something, you have to think first before actually doing it. Because whatever action you will take would affect the lives or fate of other people around you. You cannot feign ignorance because Karma will dish out the same to you. Not only that, one or twice would not satisfy Fate and you will find yourself on the receiving end more than once.
So, think twice before you act. And do not revel in the feeling that you have control of others's Fate.