The mass media. If 50% of people like X then any TV show that wants to kep its ratings will appeal to X. Doesn't matter if thre are 10% liking each of Y, Z, A and B, the TV shows are terrified of being cancelled, and will thus take no chances in putting anything other than The Thing Most Likely To Succeed out there. They magnify our tastes, feed them back to us, and leave (young) people assuming that the centre of the mainstream is all that exists.
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