First of all, the idea of the 'Samurai spirit', is based on a religion. Do you think suicide bombers are brave and tough? or brainwashed?
Most of this 'Samurai spirit' nonsense is a fiction created by a Japanese General in WWII to get a bunch of young naive men to crash planes into American ships, again via brainwashing.
This is 2016, and you can ruin your body by not tapping; so if you know you are caught, you are an idiot not to tap. It is your ego, not your 'fighter's mentality'. Not only does it shorten your career, hence your earning potential, it ruins your body.
I certainly do understand a warrior's mentality, but to equate an MMA contest with a 'war' is also foolish.
In war, you have a lot at stake, not just your ego. Sacrifices have to be made in war. Those people are heroes.
There is nothing heroic in: "Hey bro look at my screwed up elbow, I can't lift shit, and can hardly straighten it out. Hear the clicking? Ten years ago, in an MMA match... and it still hurts!"