Because they committed the most unforgivable crime for a super heavyweight. they lost to a smaller man!
Well you can argue that AJ, the K2 brothers and company would have lost to said aforementioned "smaller man".
Because they fought in 1940s and their only available fights are against the greatest HW in history. That's why.
Interestingly enough, I happen to have a tapestry on a wall of stone in my Cellar that dates back to the late 1700s. It depicts a small Brown Bomber taking out Max's Brother.