Options abound if NFL players want to protest: Interviews; Organizing anti-discrimination groups; Giving to charities and groups so involved and others I can't think of. 
The original intent of Kaepernick was to disrespect the flag because, as he said the first time he was interviewed about it,  
"I am not going to stand up to show pride in a flag for a country that oppresses black people and people of color," Kaepernick told NFL Media in an exclusive interview after the game. 
"To me, this is bigger than football and it would be selfish on my part to look the other way. There are bodies in the street and people getting paid leave and getting away with murder." He deemed the entire country guilty of racism and violence against blacks when the vast majority of black killings are black on black. 
Teaching blacks to respect the police and follow lawful orders would be a really good start. Those who sow seeds of distrust of authority for political gain should be condemned.