OK, lets put ourselves in the USBC's shoes.
Bowling manufacturers are more than well aquainted with the regulations concerning any bowling equipment they manufacture. They know the upper limits at which they are allowed to go, and are aware that nothing beyond that point is acceptable.
Pushing the upper limits is a manufacturing choice a private company makes.
Then, you get an "anonymous" package from someone. In this package are products from that private company that have previously been approved, but a note contained in the package leads you to believe that someone has found out that not all those previously approved products are being made within those accepted limits. This leads to you testing the products to either confirm the "allegation", or deny it.
After quite thorough testing, you find the "allegation" to have merit, and products have been found that are above the acceptable limits, at too high a percentage to simply ignore.
NOW WHAT?
Comparisons have been made to other situations, but many of those really don't work here at all. Take the speed limit one for instance.
If the speed limit is 60mph, and you are doing 61mph, you probably aren't getting ticketed, simply because there are lots of others going far further past the limit than you are.
BUT, what if EVERYONE ELSE is going 60mph or less? Then, you stand out as the lone person breaking the rules, and are far more likely to be picked out and ticketed, right?
Motiv broke the rules. I believe it was inadvertently, but that is also irrelevant as it doesn't matter why, or how, the rules were broken, only that they were.
USBC is a rule making, rule enforcing, governing body, who's job it is to ensure those rules are being followed, and enforce them when they are not.
So really, HONESTLY, what were their options? And, what would you have done if YOU were the sole entity in charge of making sure EVERYBODY follows ALL the rules to the letter?