But in the 80's, when this fall took place, MADD Canada wasn't around (it was formed in 1990) and driving laws were a lot more lax.
In general (I was around in the late eighties) I'd say that that's the time when drunk driving basically became socially unacceptable in Canada. I think it's still acceptable in the US to a much greater extent. Whether that was because of MADD or not, I don't know.