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Completely irrelevant to the legal aspects: Owners of music copyrights should celebrate every time someone uses their songs in Youtube videos, because it is wonderful (and free) advertisement that is far more effective than the paid-for kinds of advertisement. The audio quality in YT videos is often pretty low, and I've bought numerous albums solely because someone used a song as background music in a video.
More relevant: I would be less critical about copyright regulations if the aspect of actual damage played a role. For example, did the band/copyright owner lose money because the professor used the song in his lecture or in the video? No? Then who cares. Yes? Then it should be stopped.
It is fortunate that copyright didn't exist in the antique and in the middle ages. We'd not be where we are.
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