Imagine an ad for a virtual puppy game using hydraulic press to crush real dogs, showing closeup of twisted broken head and blood splashing on camera and all. Surely you can understand why most people can get very upset seeing that, and dog owners in particular can feel like their soul is being crushed?
Well, artists and musicians can have as much emotional attachment to their tools as pet owners to their pets. To most people the ad is only slight disturbing, but to the artists (and the nostalgic) it’s soul crushing. That’s why Apple is apologizing: they’ve offended their core market.