Mothers who daydream about imprisoning people for victimless crimes, without realizing they are putting their own progeny in peril. MADD is fun until your son/daughter blows a .09 at a random checkpoint and gets expelled from university after criminal charges.
Widespread adoption of breathalyzers was sufficient. We don't need angry mothers on the loose, even if we feel sorry for the ones who've lost loved ones.
We live in a weird world. If Dad went to the drunk driver's house and shot him to death, Dad would be put in jail for the rest of his life. If mom throws 1,000 innocent people in jail by lobbying for new laws, we're supposed to celebrate her "achievement". See also: marijuana prohibition
Every day, about 30 people in the United States die in motor vehicle crashes that involve an alcohol-impaired driver, how is this victimless?