Something as destructive and addictive as methamphetamines should not be legalized. Age limits also encourage illegal use. Does this not apply to alcohol in your area?
The government needs fear to keep its people in check. There’s a line between communism and democracy and the United States government has not passed it. Why? It listens to its people. It encourages competition and doesn’t take by force unless it’s illegal. This is a matter of both national and financial security, and if some people need to be spooked, so be it.