I suspect this subject has already been dealt with, and I apologize if I'm just repeating at this point, but I don't understand why players will not "move" their cue ball after a foul or bad hit in billiards. Sometimes the cue ball will be reset on the line behind an opposing player's ball, thus snookered, and they still won't move it. I've started telling my opponents that moving the cue ball is permitted, and some still say no. Why? Thank you.