Oh, BS.
They're not afraid of Trump. They have kept him at bay for over 30 years. They're afraid of the empty seats and declining television ratings. The Left desperately wants this to be about Trump so they can justify their disrespectful behavior, not that it does.
The National Anthem is not a platform for protests. Doing so insults the country, the singer, and the countless people the anthem represents. They can lie and say it doesn't insult anyone, try to claim "police brutality" or any other ridiculous claim, but it's no different than calling a tail a leg.
The rude behavior of Kaepernick and company is costing the league money and respect. So shut up and either stand for the anthem or go back into the locker room.