A lot of actors have personality disorders. The mimicry of the behavior of others is a technique in navigating social situations when you are unable/unaware of how you feel.

In the "crazy interview" Tom did for scientology you can literally see him flick through a deck of emotions. His entire demeanor is a bit like a random walk through mimicking the emotional states of others.

I can't recall if I had any idea of the trigger in that case. But, hypothetically, it could be a technique to disguise an unpalatable emotion he was havin. Often, I believe, this would be rage/anger/contempt.

I wonder whether the "intense eyes" of cruize/kanye/etc. are that of an intense rage/contempt. Their demeanor is certianly mimicry, what it is they would be emoting is harder to ascertain.

People describe being around that type as like "walking on egg-shells". That's because they really are in an anger-prone state... you just can't see it. But you can "feel" that if you slip up, the rage will become public and take the form of abuse.