Harry Potter Fanfic Cliches

[Shepherd]

Fridge logic time:

If the Death Eaters can add the term "Voldemort" to the taboo list, why can't they do the same with "You-Know-Who" and "He-Who-Must-Not-Be-Named"?

Also, why didn't the Ministry ever make the incantations for the unforgivable curses Taboo?
As a long time reader of Marvel comics, I'm familiar with Stan Lee's concept of the No-Prize. If a reader found a discrepancy in a comic and then gave a reasonable explanation for the discepancy, Stan would declair that they'd won a No-Prize. In that vein, perhaps "Voldemort" was the only Taboo because you can only have one Taboo word at a time. And perhaps the Ministry never used the Taboo for an unforgivable curse because the ritual for setting a Taboo is vile and horrible.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV