All this ethical navel gazing is part of the growing pains of the electronic age, I think. I would bet every age had its controversial developments that were anxiously embraced by some, and reviled by the conservatives. Sampling is no different. The part that remains the same is - can you make music?
Interesting trivia when it came to some of the "Masters" -
* Beethoven indeed did not play MOST of the instruments he wrote for. He would have "first readings" by players to see if there were some impossible passages he wrote and could edit them.
* Chopin, it is largely agreed, probably was incapable of mastering his more demanding piano pieces. In fact, he really didn't like public performance much at all. The few times he actually did perform, he chose to play his simpler, slower etudes and preludes. So who performed his flashier pieces in public? Why, his virtuoso friend - Franz Liszt.
* The saxophone wasn't introduced into the symphony until the work of German composer Richard Wagner. Many thought it to be a brutish, unsophisticated instrument and thought it would spell the end of the symphony as performance ensemble. So controversial was this, and other Wagnerian experiments that a critic who heard the opening night of one of his operas wrote in a German newspaper that "Herr Wagner has written an opus that sounds very much like someone threw a bomb into the orchestra pit."
Well there's more, but you get the drift. Every innovation or new age in music is met with fear or skepticism by those who think they are preserving "real music".