It's so easy to drink underage and it is such a rare occurance for people to get in serious trouble.

If you lower the drinking age, people might start drinking at a younger age overall. There are some consequences, but I really could care less about the drinking age. I mostly drink in the privacy of my own home and have not had any trouble walking around the streets carrying beer from one place to another (knock on wood I also know people who can get me beer so it's no problem.