[nommm-nommm]

collecting things that interest you in a compulsory manner vs marijuana use

The key difference to the government is hording can be perfectly legal while marijuana use requires you to participate in the black market.

[thingexplainer]

Which is a pretty flimsy reason to believe an adversary might find leverage against you. But hoarding is a force multiplier in the adversary's favor.

[nommm-nommm]

I think it's more about willingness to participate in black market activities makes you untrustworthy in the government's eyes.