I could have written that post, AirlinePilot - though you probably did it better than I would have.
There are a few, a very few, who listen. The vast majority make it clear that they don't want to hear it. They roll their eyes, talk more loudly, change the subject - yep. I know exactly the behavior pattern you mean. A few do believe. They quietly agree, they tell a few others. I don't know if it does a bit of good.
You say you don't expect Mad Max. Perhaps you should reconsider.
What happens when the grocery store shelves are empty, governmental services fail, and the masses are a little afraid and a lot angry? Did anyone but me note the situation in New Orleans, immediately post-Katrina? Even the police abandoned their duty and joined in the looting.
Is your city different? Is mine? Perhaps in degree. Perhaps. But I wouldn't stake much of a wager on it. The various centrifugal forces in our society rival those in pre-civil war Yugoslavia. There are lots of people in our various nations that hate people of other groups. Will they continue to be peaceful when central authority weakens - or fails? I think not.
When the disruptions and problems of peak oil hit - really, truly, no denial, no cornucopian nonsense, hit - the masses will transform into a howling mob. We will pray for martial law.
I suppose its true. It won't be like Mad Max. It will be considerably worse.