I think you're misinterpreting that article. It's purely an observation that Wisconsinites self-reported more of what some team running a survey classified as "excessive drinking, there's nothing about causes.

I'm not from Wisconsin, but I know quote a lot of people who are, and I think the reason they drink so much is cultural: they have a much more relaxed attitude towards alcohol consumption, generally (e.g. aunts letting nephews/nieces drink at some family get-together). It's not so much they're "driven" to drink, they seem to enjoy it and not attach so much stigma to it.