I'm working from the assumption that the more people talk about something, and the more we view that talk as acceptable, the more likely people are to follow through on that talk and do those things.

And vice-versa. (The more we shut down communication the more we shut down action.)

I don't believe it can be absolutely effective. And I don't have any data to support the notion. But in looking at various social strategies aimed at encouraging/discouraging various behaviors, it certainly seems to be accepted wisdom.

And, anecdotally at least, it seems to effect real behavior among people I've known.