We all have choices in life, I choose to be delusional in a inconsequential village out in the boondocks of Thailand, where the uneducated locals work tirelessly in dead-end jobs to make a living for their families, something in my opinion western culture has lost.
Muay Thai is not for everyone, but for some it is away of life, as in all sports some train every chance they get, but getting in a ring for the first time with the whole family cheering them on is magical. Lads and Lasses who you know have been well trained and are as fit as they can be take one hard kick/punch and it can be like sticking a pin in a balloon, bang and they're done, never to try again, but some thrive on it, take the pain and dish it out, the injuries at the local level area, are a calculated risk where every precaution possible is taken, Doctor always in attendance, with a medic and ambulance.
This is all in the first tier of the sport, not as in the you tube video you posted which is to do with the "Professional Game" which I know is all about the money and betting with little regards to injuries, and all to do with money.