I think the biggest problem is that it's a heavy handed message in a world that excuses even worst behavior. Skeleton Remote guy was just a businessman who was providing a way of defending yourself. Now I know the gun allegory is supposed to make everyone feel warm and fuzzy on the inside but we haven't seen a crackdown like the Skeleton Remote guy on the villains, especially Boxmore. Boxmore has gone on record selling robots to a cabal of villians that use them to harm the populace, primarily the Plaza. The government should be focused on shutting down Boxmore and the villain cabal since they're creating weapons of war against the people. In this same logic because people like Dendy create their own weapons which still cause damage to the populace because of negligence and without licensing them, she should be put to jail as well by the same rule.
The second main issue is that people have so many more destructive weapons than a skeleton remote. NotRedRanger has a fully weaponized tank, Rad's Van is practically a rocket tank thanks to Dendy, the Bodega sells weapons ranging from flame swords to energy blasters (actual guns mind you), and almost everyone has some of power on par with a weapon anyway.
I know people are going to say, "but it's a kid show". Then why would they even bother with the episode when it's the most slack-jawed hackney attempt at anti-gun activism in a world where it doesn't fit and makes no sense.
If you want something poignant, make KO go full liberal again and get Boxmore taken down and all of his stuff seized. Then because Sharon, Darnell, and the rest of the robots are considered weapons and not people, they are forcefully dismantled and melted down for good. No second chances, no backups, they might as well be dead and KO and possibly Rad if they remember he might have feelings for Sharon, has to watch it happen.