Your claim should be like " Saying the pledge should be optional, as ignoring it is demonstrating people's freedom of expression and it helps promote social justice."
Your evidence could include the first sentence from Text 1, Colin Kaepernick's quote from Text 1, Brandon Marshall's quote from Text 1, Roger Goodell's quote in Text 2, and counter Drew Brees (in Text 3) by saying that the flag gives people the right to express themselves, so it isn't disrespect when you actually do express yourself.
You could conclude with "The ideals of the USA include freedom of expression, so demonstrating this should not be condoned. Though people may think it's counter productive, by disrespecting the thing that gives you your freedom, it isn't, because our country needs change now, otherwise we will never improve," and summarize the evidence.