So where is the line where rules are just ignored, and people do whatever they want based on how nice they are? I think having control and responsibility of one's actions is more adult than saying "it's OK, we'll just forget about your mistake" which is what people do with kids that don't understand what they are doing, and even that stops around age of 12. The player messed up the game, not by some accidental touch as he was shooting a ball, but by walking up, grabbing the balls and rearranging them with purpose. While in the grand scheme of things a pool game means nothing, organized competition like a league is based on set rules or it's just a mess of crap like what happens with all the bar bangers that pull rules out of their butts as needed.
I mean the APA wants you to mark the pocket for the 8 ball even when it's clear where it is aimed at, and the other player can call it as a bad shot even if the ball is an inch from the pocket it goes into. That totally contradicts any "niceness" feel the APA wants to have in being willy-nilly with the rules. They made a goof, they pay for the goof, they learned from the goof not to do it again.
The rules on accidentally moved balls in play during cue ball fouls only, is just that, IN PLAY. You are lining up a shot, you touch a ball, can move it back. If you are walking up and grabbing balls during the game, that is a bit beyond "accidental ball movement". Any time more than one ball is moved, it should be a foul in ANY rule set, and is in most, outside of the APA, which again treats their members like children that are incapable of controlling their actions. If a kid draws on a wall it's a "mistake", if an adult does it, it's vandalism. That's why there are different laws for those under 18 and those over 18.