These are obviously ineffective, but her line of reasoning had some sense: snails tend to be general Squick in anime (it's used in other anime too, usually with negative connotations), and she probably figured a car lover like Keiichi would react at the destruction of even their likenesses.
Needless to say, Skuld was wailing at the whole 'spectacle'. A later episode has Urd go further by forcing Skuld to look at a whole table full of useless machines just moving around after the latter committed a graver offense.Skuld: Noooo! Don't make me create robots that don't do anything useful! Pleeeeeease! Urd: Good, good! Now make a robot that does nothing but go around in circles!
