My point being that for far too long, the government has been very successful in brainwashing our society into viewing a certain group of drugs as "evil"
That kind of de jure and de facto manipulation is exactly what we're talking about. You can call it whatever you want, but the meaning behind the words used is significant, as their is reason for that meaning and that meaning has certain effects itself.
Imperial governments also subjugated local colonized populations by brainwashing them as well, often through missionary work first and then other "scientific" or "moral" methods. E.g. The White Man's Burden. At the same time, and continuing to this day, governments continue to control their own populations via the same and similar methods, in order to create/recreate/maintain power structures that keep the government intact as well as keep society running smoothly when it comes to certain dominant interests. Culture can be just as coercive as it can be liberating.
Hence, the decolonization of minds is, along with material liberation, is a prerequisite to living in a truly just, free and humane society.
Ideas are powerful, although guns are too (imho guns are more so, but ideas are not necessarily less powerful under certain conditions, when used in certain ways). I guess you could say ideas can be more insidiously powerful.
Combine the guns and ideas, with guns backing up certain ideas, upholding Law and Order, you've got a real force to recon with. Especially when it protects those vested interests and the status-quo enshrined in the power structures of the day. To complicate things "revolutionary" cultural or civil movements are often co-opted by this power structure, granting a little bit of often superficial chance in order to maintain a certain facade - that things have changed in a much more meaningful way than they actually have - all the while doing nothing but actually strengthening the power structures that be. In most cases, nothing happens to the old power structures but their recreation, making them even more powerful and domineering than before.
A bleak way of looking at things, yes, but true in more ways than not.