It is about using the emotion of a so called problem and intervening government in the middle of it...which is something you state is a problem with liberals because of emotion...the exact same thing you do for laws that you favor.
Here is on article on its use...looks like almost no impact on use
https://www.usatoday.com/story/news/nation/2020/10/21/legal-marijuana-data-show-minimal-effects-teen-use-traffic-deaths/6005737002/