> It's not as if the 'u' is the letter that carries the bulk of the offensiveness, and by omitting it one can make the word less taboo.
I believe the letter 'u' is particularly selected for omission, because, as the only vowel of the word 'fuck,' it is considered to be its "core" sound.
This is indeed related to the bizzarre practices of bleeping swearwords on TV, which as you say implies that vowels are the things which are really dirty.
Back when he was a radio DJ, Ricky Gervais used to get a lot of milage out of discussing the art of Kunst, the philosophy of Kant, and fellow DJs Sarah and Carl Cox at 2 in the afternoon.
I believe the letter 'u' is particularly selected for omission, because, as the only vowel of the word 'fuck,' it is considered to be its "core" sound.