LOL, I think that is the post hoc rationalization because they really can't make them perfectly quiet in any sort of reasonably sized package. They would if they could. After all, if people can't hear it, then it definitely would not sound like a gun...anything else...or anything at all other than silence.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011