Capital Letters Were Always The Best Way Of Dealing With Things You Didn't Have A Good Answer To.
Why' is the only question that bothers people enough to have an entire letter of the alphabet named after it. The alphabet does not go 'A B C D What? When? How?' but it does go 'V W X Why? Z.
The only moral it is possible to draw from this story is that one should never throw the Q letter into a privet bush, but unfortunately there are times when it is unavoidable.