Trumps point was a valid one. The DNC convention, in case you did not notice, was not a funeral or a memorial for fallen American soldiers. It was a big fun festival built around the goal of getting Hillary elected.
The father was not grieving. He was trying to make political hay out of his dead son while his silent wife (women are 3/5ths of a person according to Saudi law) stood next to him like a paper weight.
Of all the dead and wounded in Afghanistan and Iraq, they managed to find a Muslim.
What are the odds?