Unlikely that you can be enlightened, but perhaps I can attempt it.

The US was founded by men who believed in self government, and the notion that government's role is to serve man, rather than the opposite. One of the ideals of freedom is the right of citizens to peacefully protest injustice.  It's an inalienable right laid out in the Declaration of Independence, and codified in the Constitution. The soldiers who have fought and died in our military did so to support these ideals.  

Perhaps rather than snarling at these men who have chosen to respectfully protest you can take a moment to reflect on their situation, and try to imagine what it would be like to walk in their shoes. Think about a time when a black man couldn't use the same restroom as you, eat at a restaurant or ride in the front of a bus. Think of what it would be like to be sitting in your car as a legal concealed weapon holder, and have a cop shoot you for following the law, purely out of fear of your skin color.