I actually don’t believe that any of the accused in this care were intentionally cheating. Honestly it seems damn difficult to make any kind of consistently predictable trajectory change with the touches we’ve seen on video.

Your math and mine both show that a touch can impact the rock but I have to imagine that curling is like golf where you train and hone your swing (release) trying to make it as consistent and repeatable as possible. With that in mind you wouldn’t WANT a touch that mucks with the trajectory of the rock because you couldn’t ever do it precisely and repeatably enough to make it worthwhile.

In my opinion this controversy is happening because some curlers have an ingrained release routine that includes an unnecessary movement / flourish and competitors have decided to make issue of it because it’s getting close to giving a competitive advantage. That’s my two cents for what it’s worth.