That's right, the forces going inboard are compounded by the leverage that the forces at the tips have.
To put it bluntly, all who think they have a "leg up" on the next guy in the engineering department should try AMA Fast Combat for a few years. Then those degrees in Engineering will have been qualified for what we're talking about here.
C'mon guys, let's see those 10 oz airframe designs that will hold up to 130 mph, 2 loops per second and an occassional meeting with the Earth.