Music is not fodder; music is not publicity
As A.C. says, copyright theft is not like ripping off someone's TV from their house. Writing songs, writing books and poems, painting or making an art video, creates more than just a thing. Copyright came about because it was thought that 'ideas' 'words' 'tunes' weren't able to be stolen, only copied, but that this was still a loss.
To lose ownership of one's creations negates and cuts into your creativity.
In my personal ife, I am a novelist and writer. I had one of my online 'how to write' columns blatantly plagarised by another (and more well known) writer on her own website. The damage was just not passing off my work as hers, but a visceral blow, a loss of myself, in a way that is hard to describe. I can only offer to the world my creativity for their delight (I hope) and I don't do this selflessly: I want to be credited, and I would really like to be paid for it. You pay the baker to feed your body, but a musician (and a writer and a poet and an artist) feeds the soul. Just because the tune is an intangible doesn't mean the musician should enrich your life for nothing in return.
When I see website owners insisting that they are giving the musician publicity, I wonder why they think publicity is the musician's goal. The musician wants to be heard and to get a reward. It's not to be 'known' that they record, it's to get people to listen to their music.
But when your life is transformed, even if only for a while, by a magical song, why do you decide that the artist is willing to do this for free for you? That we live on your love alone? I know musicians and writers who were brilliant but crushed by the system. Their potential gifts to the world will now never be. The RIAA is not their friend, but VCs and website owners and those who want to diss The Man are not their friends either.