Disneyland Magic Man, you're just digging a deeper hole for yourself. Putting aside how pretentious you sound, your arguments are facile.
A)There is no moral choice in combining songs. It is your OPINION that combining Singing in the Rain and Umbrella is a bad idea. It is your OPINION that it didn't work. That does not, in any sense of the word, make it morally wrong.
B)Actual people watch Two and a Half Men, doesn't mean they think they should behave like Charlie Sheen. Actual people watched Lost, doesn't mean they think if they crash in a plane they're going to become guardians of the human race. Actual people watch Glee, doesn't mean they think they can act like Karofsky and bully people because of it. See, most people can distinguish between reality and fiction. It's something we learn early on. I teach 7th and 8th graders. They're aware that Glee is a fictional show. It's not that hard.
C)"It is morally wrong to present a piece of dramatic work, straight play or musical, in any other fashion than the author's original wishes."
Again, according to who? To you? Once the author's written it, it's out there. LEGALLY, some works can't be altered, but MORALLY it's called artistic expression. Are you saying that, according to your strict moral code, every production of every show should look exactly the same from here to eternity? No one can ever try something (like The Hot Mikado or Carmen Jones) because the original author didn't give their approval?
D)As an actor, you sure have a limited grasp of human emotion. You say you don't get how anything positive can come from Glee. How about the fact that it brings enjoyment to millions of people? I have no interest in Sex and the City - I think it's ridiculous fluff - but I wouldn't begrudge anyone who enjoys it they're pleasure in watching it. How about the fact that kids ARE learning new songs now? Are you afraid that people are going to become interested in the arts, perhaps people with more talent than you, who will be auditioning against you now? Besides, why on Earth would you worry about an actor auditioning with a lip-synced track? What director would cast that person, or are you really just that bad of an actor? Your worries here make very little sense.
Hi, Shirley Temple Pudding.