The reason that has to be done is precisely that the law has no common, well-architected rationale. The vast majority of law in common-law jurisdictions is ad hoc precedent from decades or centuries ago, patchwork laws that match current, ephemeral intuition about what the law should be, etc. Perfect and inevitable enforcement makes this situation a nightmare, given the expectation that the average US citizen commits multiple felonies per day. Something will have to give.