Another aspect of this is it allows some gamesmanship. If you pull off a safety perfectly, a simple "dang I was half a diamond off" will have your opponent cursing lady luck and thinking about rolls. Let them believe you were trying to pocket that object ball that missed by half a diamond. This is about the extent of my gamesmanship but it can really work on an opponent to think you keep getting lucky rolls.
I'd rather be known as lucky than good, keeps people on their toes and can sometimes lead to players discounting your ability, leaving you an easier out. Pool is a strategic game that is often played between the ears.
All of this works better when you're not pointing your stick at your targets and kind of keep your aiming on the down low. Don't give them any info about what you're trying. You can also use the stick pointing to make them think you missed or lucked in a ball in the other pocket if you're subtle about it. If I'm playing 9B and have to do something exotic, I'll sometimes decide what to do, then mess around looking at a different pocket with pointing my stick and such. The OB goes where I initially wanted it, but it ends up looking like luck. Fake luck can be a strong tactic on a certain type of opponent.
Fun times when they tell me I should buy a lottery ticket!