People should know when to stop themselves. While some people have chronic abuse issues, and real addictions, their issues should themselves be understood as medical issues, and reasons why people should have their drinks monitored. Enforcing a hard limit on drinks consumed would also be almost completely impossible and impractical.
There should not be a restriction on how many drinks someone can consume because consumption of anything is personal behavior and any such restriction would be an infringement of personal choice and privacy. Instead we should focus on existing safety laws like drunk driving laws and enforce those rather than trying to control individual lifestyle choices that do no harm to anyone.