(1): The article you posted did not say that Mr. Khan supports Sharia law. He described it.
(2): Mr. Khan frankly said that he does not support Sharia law when he was interviewed. He supports the American constitution. (It is in the clip you posted).
Facts and reality will not change just because one chooses to ignore them. To attack the father of an American soldier with such blatant distortion is disheartening and disgraceful.