[EvanPlaice]

Actors are free game because they're public personas aren't 'real' people to begin with.

Reduced to childhood terms, they're the kids on a playground playing doctor. Yet, as adults we treat people who play doctor with equal or higher regard than those who actually are doctors.

It's pretty idiotic but we all tend to attribute image as a viable replacement for substance.

South Park just points out the ridiculousness of it all by poking fun at those who take their image too seriously or make a mockery out of their status as a public figure.