As for being an overblown reaction to one law... I think it's a big deal. My girlfriend and I having to break a law to have sex without worrying about having babies? What next? It's a slippery slope and I'd rather not have policemen and lawyers intruding on my private life if one overzealous private citizen happens to report me or, simply, not like me and therefore tries to make my life difficult.
Breaking the law... I don't enjoy the feeling that I'm at risk for prosecution by the state for doing something I believe is perfectly acceptable. The illegality of marijuana's enough for me to have to deal with.