not an expert in USA laws but freedom of speech is governed by some exceptions in constitution and one of them is “SLANDER”. If you think the movie was not a slander, that’s another point.
for your second point, it shows that you have a difference of opinion at best. There is nothing agaisnt unity there. You and I are united in condemning the movie.
why? did entire Muslim ummah remain silent on 9/11? Pakistan for one had to suffer the most in aftermath.