Have you not sat next to a morbidly obese sweating person whose mounds of fat are spilling onto your leg, arm, shoulder? You should try it some day.

The fairest system IMHO would be to give everyone a "total weight allowance" that includes, you, and all your luggage. And if you're so big you spill onto other peoples laps, buy extra seats.

Next you'll be suggesting we give terrorists equal rights on flights as well! They're people too!