The history of the "Mo' rule" : Prior to 1982 if a defender intercepted a pass inside his 5 and his momentum carried him back into his endzone where he tipped over ,it would become a safety-very unfair. The only alternative was to rule "the force of the ball
" drove him back into the endzone -very unlikely -you could rule it a touchback
. Then along came "Mo'", a comprimise of sorts, and giving B/R the ball at the point of possession. The intent was not to give B/R blanket protection for any fumble or flag that might later occur.