Moreover, the only effect produced by this censorship will be the increased popularity of the n-word and the situation in the class while talking about Mark Twain will be the same.

I wonder how they came up with the total number of positions in the first place. If you think about it, the cube cannot be in just ANY position. If you just re-stick the colourful stickers, the cube will become unsolvable.
You can only arrive at states which you can achieve by turning it - so that you can turn it back if you want to solve it.
Therefore, if they came up with the number of the possible states that way, then they MUST have realized that they will not need more than 20 moves to arrive at a state that has not been recorded before.
If they found that number by calculating combinations, then it must be wrong.

Looks like he had a small anger management problem. Although I've heard somewhere that he had some tough personal issues. I don't wanna judge him, but since he already did it, I'd applaud his audacity :)