I agree, but driving while high is not at all safe. Sure, it's less bad than drinking, but it's still more dangerous than driving when sober (and rested). Accident rates have gone up since legalization. [0,1,2]

[0] https://www.cnbc.com/2017/06/21/auto-crashes-are-on-the-rise...

[1] http://gazette.com/study-finds-fatal-crashes-in-colorado-hav...

[2] https://www.washingtonpost.com/news/wonk/wp/2017/06/26/what-...