Please, dear readers, don't let this sound encouraging (and no shade to you commenter, I'm not disagreeing with you, just adding on top).
Broad unenforceable laws that everyone basically constantly violates because of how they're written - these are actually weapons used to perform selective enforcement.
Speed limits are a good example, in many jurisdictions all speed limits are artificially low, everyone goes the "normal" speed, and this allows cops to pick and choose their targets. This is partially how "driving while black" could be de facto criminalized, if that reference is familiar.
Them being bad at this stuff is not as helpful to us as it may seem, when ultimately this and many other laws have a primary purpose that supersedes the stated aims of the law. That purpose being, facilitating targeted enforcement by giving a plausible air of legitimacy.