When I bought my first new car in 2001, I was technically a "subprime" customer. I was 20 and had a FICO score of less than 640, mainly because I hadn't built my credit up.
If I were looking to buy in today's market, I guess I could immediatly cross GM and Chrysler off my list, since I'd never be able to find financing. That's not fair to me, nor is it fair to GM or Chrysler considering I could walk into a Honda dealer and get financed (along with another 20% of Honda's customers).
Was I an "irresponsible" customer? Considering I made every payment on time, paid the loan off early, and am now sitting with golden credit, I'd say no.
I'm all for proper lending, but there is a difference between fair lending and simply not offering financing to 40% of the population.