Yeah but he wasn't targeting the fighter. The ref was seen as being aggressive first, and Conor pushed him.
This is maybe the only time in MMA where guys jumped in and attacked the fighter.
And every situation is unique, so they're not going to take previous events (ie: Conor throwing the dolly) into account. That incident was litigated already and Conor suffered some financial loss from it and occurred months ago. Khabib crying unfair treatment for his jumping into a crowd or his boys attacking is just lazy deflection off a boneheaded decision on his part.
One more point, Dana knew that extracurricular fighting was possible, which is why he and the NSAC officials met with both camps TWICE on fight night to remind them that afterwards only Dana was allowed into the ring and he'd decide who came in. Khabib's cousin and his two training partners didn't listen clearly. These are some of the reasons why the hammer will come down on them. They were warned, and they didn't care.