combatpig:
Fly a light model sometime, then you will understand. It's very possible to build a good looking model light enough that only an idiot could crash.
We've got your point already (about 4000 times in as many threads and posts).
Even very light airplanes will do this. I agree weight factors in greatly, but before it happens, you're dealing more with physics than weight. It has everything to so with that critical angle of attack, and pushing yourself past it. Then the weight wil bite you for sure.
But with that said, I am not "always" a proponent of lighter = better. It does factor in with the context of the topic though.