1. 18 is the age of adulthood in the United States, and adults should have the right to make their own decisions about alcohol consumption. Turning 18 entails receiving the rights and responsibilities of adulthood to vote, smoke cigarettes, serve on juries, get married, sign contracts, be prosecuted as adults, and join the military - which includes risking one's life.  
2. Allowing 18- to 20-year-olds to drink alcohol in regulated environments with supervision would decrease unsafe drinking activity. Prohibiting this age group from drinking in bars, restaurants, and other licensed locations causes them to drink in unsupervised places such as fraternity houses or house parties where they may be more prone to binge drinking and other unsafe behavior. 
3. Traffic accidents and fatalities are most common among newly-legal drinkers, regardless of the MLDA.  In 2009, the 21- to 24-year-old age group had the highest percentage of drivers in fatal crashes with blood-alcohol concentration (BAC) levels of .08 or higher – 35 percent.  Any increase in traffic accidents or fatalities in 18- to 20-year-olds would be offset by a decrease for those 21 and older. 
4. There are fewer drunk driving traffic accidents and fatalities in many countries with MLDA of 18. Although the United States increased the MLDA to 21 in 1984, its rate of traffic accidents and fatalities in the 1980s decreased less than that of European countries whose legal drinking ages are lower than 21.     
5. The decrease in drunk driving fatalities as a percentage of total traffic fatalities in the United States does not correlate to the MLDA.  Since 1982, two years prior to the Uniform Drinking Age Act establishing an MLDA of 21, a decline of drunk driving fatalities occurred across all age groups and demographic categories, and therefore cannot be reliably attributed to MLDA 21.
6. Lowering MLDA from 21 to 18 would diminish the thrill