serve to legitimize anti-Muslim and anti-Arab bigotry in our society and could lead to further discrimination against members of the Islamic and Arab-American communities
Too late
Unfortunately, what legitimizes anti-Muslim and anti-Arab bigotry in our society is the continued terrorist and racist activities of Muslims and Arabs. If they would stop blowing people up and stop trying to take over the World at the point of a sword, 99.9% of the people would have no problem with them at all.
Take a look at the Indian (meaning Hindustani) community in this country. They are every bit as foreign and unfamiliar as the Muslim or Arab, but they are generally peaceful. They don't promote violence, and they don't want to take over the World. While there is some friction in areas with a large new immigrant Indian community, as there always is, not many people really go out of their way to persecute Indians. Anybody who does so is rightly seen as a bigot.
If the Muslims and Arabs would live and let live, they would find that the vast majority of Americans are of exactly the same mind.