Are you intentionally misrepresenting the Khans' comments?  They didn't "denounce Trump for the loss of their son."  They spoke of their son's patriotism and loyality to America and his fellow soldiers.  They addressed the fact that you can be a devout Muslim and a devout, dedicated American at the same time.  They addressed Mr. Trump's blanket condemnation of Muslims and his repeated xenophobic attacks on immigrants and minorities.  Perhaps you need to watch the video of Mr. Khan's speech and the interviews they've held since.  It's fine to attempt to defend your candidate and his actions, but you should try to at least be a bit more accurate and truthful as you do so.