Jobs' "thermonuclear war" comment left open the possibility that Apple and Google might be acting in a more hot headed fashion than the average company.
It may be that hot heads were an issue but while we're evaluating the Maps deal loggerheads, let's remember that the original Maps app completely predated Google's releasing a product that directly competed with the iPhone. And that it's not surprising that, hot heads or not, this was bound to change Apple's calculus about (1) whether to continue with Google as a Maps partner and if so (2) how deep they were going to allow it to integrate.