I like beer with food and mixed drinks with friends. Sometimes you drink more than you wanted. You remember the amount and the mixture of drinks, then you change things the next time. Simple, no?. People who obsess (all or nothing) are the people who go too far and have problems e.g. abusive drunks, addiction. It's a recreational drug. "Recreation" implies leisure and fun. If you are using it for any other purpose then you have real issues you need to address, thus only adults capable of handling adult problems (in theory) can buy alcohol.