Referees and umpires in general get paid beans, do it because they love it, and often have a thankless job. Too early of a stoppage, too late of a stoppage, whatever. Almost never does a fighter admit the fight should've been stopped. Look at CoGar. In fact, look at what Cachociera (sp?) herself is saying. She is glad they let The Bullet bang....bro.
Until they pay way more money, nothing will change with reffing.
EDIT: missing a tap was really bad, though, gotta admit. I am just commenting on the overall "profession" and how they can't win.