Or it could because there is increased awareness of the originally racist and authoritarian motives for modern drug laws? I'm not of the mind that weed cannot and does not frequently become a bad habit but weed abuse is far less problematic than alcohol abuse yet the former is treated as a criminal affair.

Black people are the most consistently anti-police demographic so I don't know where you're getting the idea that it's "young western kids" that are propagating the anti-police rhetoric.