It's disheartening to see something like this happen. There are countless complaints of early stoppages in numerous fights from various organizations in the past, but as was eluded to by Dr. MMA, the alternative is much worse. Almost any fighter steeping into the ring/cage will want to believe that they can continue and find a way to win, but it isn't worth sacrificing more of their long-term health to give a seemingly infinite amount of time to the fighter to recover.
Originally Posted by Fedorlei Gomipierre
Some fighters have a higher tolerance for taking shots, akin to Nick Diaz. They can get dropped or be put in a terrible position, but can find a way to get out of it without losing consciousness. And then there are others who either never had the ability or lost said ability, like Chuck Liddell late in his career. Or, perhaps to use a more recent fighter, Frank Mir. He's a good example to use in such a topic because even though the fight was stopped after he hit the ground, he didn't take any more unnecessary shots after getting dropped. Go back to the fight with Shane Carwin and you remember him flat on his stomach as Carwin threw punch after punch with almost no sign of stopping.
Yes, they knew what they were getting themselves into. But the referee's responsibility is to make sure the fighters don't take any unnecessary damage after getting dropped. A fighter's history is usually a decent precursor to follow when assessing said fighter when he/she is in a bad position to potentially take more damage.