Huh? I'm confused... Isn't the goal of the class to make sure that the student understands the material being taught?!
If everybody has a solid understanding of the material, everybody should get an 'A.' If nobody has a solid understanding of the material, then they should get an 'F'. I don't see what benefit controlling the grade distribution offers, except penalizing or rewarding students unnecessarily.
I'd appreciate any comment with a logical basis... it doesn't even have to agree with me.