Mixed martial arts already has an unfair reputation for being a glorified cockfight with no rules. Nurmagomedov didn't do much to dispel that opinion.
The Russian grappler's attack on McGregor's corner may have been deserved, but he should know better than to risk the safety of the fans and reputation of the sport with a poor decision. He embarrassed anyone associated with the sport and doesn't deserve the honor of holding a championship belt.
If someone insulted your father, country and religion, you would be pretty mad too. McGregor and his team did all three and they expected Nurmagomedov to shake hands with them after?
Maybe things got a little out of hand, but it's not like the Russian attacked the crowd or used performance-enhancing drugs. There are many reasons to strip a title. Defending your family's honor should not be one of them.