hoptis and comfortably numb make really valid points, but i'd like to expand on them a bit.
marxists use a term called the "ideological bullets of the bougiosie" - it relates to the whole state infrastructure from schools to the media to the courts that tells us that the systems fine, nothing can change anyway etc.
For drug users, we cop not just bullets but a full-blown artilllery assault with air-supporrt from pretty much day dot - "Drugs are bad mmmkay; if you use you're fucked up; users don't care about or health etc."
Running peer education programs, particularly in reallly disadvantaged areas, most users come along thinking we're going to regurgitate that message to them. When they hear something completely different it can take a long time to shift headset. Sometimes you can almost see the moment, and it can be glorious - "Wow, what i'm doing is valid; users can care about our health etc"
Unfortunately the moment doesn't change evrytrhing - i've been a user activist for 10 years and you still know, deep down, that i put myself through shit i shouldn't.
Or when trying to do a degree at uni i attend lectures where they say that all the children of drug "addicts " are neglected and malnourished, and as a father and and a user i still, after 10 years, find it easier to walk away than tgo challenge a statement which, if it was made about any other social group, would almsot certainly lead to the academic being disciplined.
In terms of mass shifts in conciousness however; that takes mass social movements behind it. This generation can change things, but we have to ber active. we have to challenge the system.
30 years ago same-sex relations had very similar social stigmas attached to what we cop now. Movements changed that.
Its not a question of which major party has power - its a question of what the communityh does in action.