Well there is BCA rules play with good players and all safeties are allowed and complimented on by the opposing player as a good shot.
Then there is "bar rules" play which means there are no rules and obvious safeties are not allowed. Actually any sort of obvious "thinking" or "strategy" is a no no!
But if you have a shot, you have 6 pockets to choose from! So instead of the obvious cut into the corner, call a bank shot back over here and that will allow you to leave the cue ball at the far end of the table (a safety play where you miss your shot and leave the cue ball in a nasty spot). As a matter of fact, you can call the shot back in that corner over there and have the object ball not come anywhere near that pocket (hit OB more full on or less full on to get CB to go to where you want it after hitting the OB).
Then say out loud "DARN! I was sure off on that shot!" (Of course you did exactly what you were trying to do and that was to leave the cue ball in that nasty spot.)
So good players can play obvious safeties and say they are doing so or pretend to pocket a ball and shoot a safety just as good. The "no safety" rule does nothing to stop a good player from playing a safety. So I think no safety rules are silly.
Another thing you can do when playing bar rules is an intentional miscue. There is no ball-in-hand penalty, so miscue and send the cue ball to a nasty spot. Then say "Darn! I need to get this tip fixed!"
Also if all your opponent's balls are in the kitchen, you can shoot an intentional scratch. Of course you try to make it look like you were going for a shot.
It is easy to get away with bank or kick shots which are way off when playing bar rules. The other players are so terrible, they don't see anything out of the normal if you are way off on your shots as well.
And if you have an easy cut shot but go for a bank shot instead, they don't see anything wrong with this as they many times bank shots they could have easily cut.
So look at where you need to hit your ball to get the cue ball to go where you want for a safety, then figure out were the OB will go when hitting it there, then say you are going for that pocket. Then when the OB misses the pocket by 5 inches, say "I almost had it!"