Media Representations, Violence and Response

What surprises me is how tired and worn out this argument is! Plato wanted to outlaw theater because writers and actors were “liars”. Augustus did outlaw theater, because it promoted “immorality”. The Roman Catholic Church forbade whole swaths of musical types – mostly things involving rhythm – on the grounds that music leads to sex (or, perhaps, that music leads to dancing that leads to sex). You take any time and you'll find people who want to stop other people from making the “wrong” kind of art – they'll want to shut up hip hop artists, burn Harry Potter books, stop kids from playing those new fangled video games.
In short, what they want to do is elevate their personal aesthetic tastes to the level of morality. As a sort of secular humanist, scientific materialist, atheist transhumanist, libertarian consensualist (read: as the intellectually autonomous person known as Chris Bradley) this sort of thing annoys me, and it annoys me because virtually everyone wants to do it, regardless of their political beliefs.
So, you'll have socialists railing against the injustices of capitalist media, you'll have capitalists wanting to outlaw socialist literature, religious folks wanting to forbid secular music, liberals wanting to stop those violent video games, etc., etc. The elevation of a person's person sense of aesthetics to the point of absolute morality is nearly ubiquitous!
I wonder why that is – why most people feel their own aesthetic choices should be universal. I KNOW there's a lesson in there, somewhere, but I'm having a devil of a time sussing it out. Of figuring out why art gets people so fucking pissed off, so pissed off that they feel the urge to engage in tactics ranging from emotional blackmail to legislation to burning books? Of why they feel that audiences are empty vessels into which artists do nothing but pour their own biases and ideals?
I don't know, but I want to know.