Shofercia wrote:
So someone's 17 years, 11 months, 29 days, 23 hours, and 59 seconds old - they cannot consent. Suddenly, in the very next second, they turn 18, and now have the magical power to consent, just a second later. Were they visited by an angel in that very second?
The law draws arbitrary bright-lines in the name of legal certainty, not because the law is denying there is a certain degree of ambiguity in borderline cases. If the law sets a speed limit of 60 km/h, it's not because 59 km/h is infinitely safe and 61 km/h is infinitely unsafe, but because passing a law saying drivers "shall not drive at unsafe and dangerous speeds" is ambiguous and creates uncertainty for potential defendants.
Likewise, passing a statutory rape law saying "you shall not have sex with individuals lacking the mental capacity to freely, autonomously and voluntarily consent to sexual intercourse with you" is way too unpredictable for people to plan their lives. An age like 16 or 18 is an arbitrary line in the sand but helps create predictability and certainty for people to stably plan their lives.