because we have proof that it did in fact happen. and it would make sence because it seems that jews are always getting picked on in history. but thats like saying, hey why dont we teach the children that the world is flat, even though its clearly round, just because a few idiots out there believe it is? hey why dont we teach kids that a dog says meow, and a cat says woof? why dont we make everyone practice every religion?
people can do what they want. they dont need to be taught what to believe in school. if they dont believe that the holocaust happened thats ok, no ones forcing them to.