Correction, at 6'4" you're in the 98.9th percentile for the U.S. What you're asking for is simply not reasonable or fair to the overwhelming majority.
They do care. They've shown that it is more economical for private companies to not make special allocations for one subset of the population, especially when customers are free to upgrade. This isn't about airlines being evil, its about your entitlement.
Yes I do expect them to care about tens of millions of passengers being able to fit.