I'm not much of a reactionary or "privacy" obsessed, but I think this is a bit extreme.

I have a license from the Ohio Department of Motor Vehicles, which I obtained using a tattered birth certificate when I was 17 (that was a long time ago.)
In other words, I don't think it proves much.

In many cases, there are only two ID checks:
Check-in and boarding. Some airports require a third at the security checkpoint (this seems to vary by time of day, screener, airport, mood, etc.)

I can't imagine what purpose it would serve to have an ID check at any additional point. So let's not encourage ID enthusiasts by volunteering identification wherever we go.

And let's not forget our chum in Paris with his fake passport and C4 shoes. Obviously the rather thorough, multiple ID checks in Europe didn't make any difference.