"There is nothing that American Muslims can do to prevent such incidents."
Ah, yes there is. Identify and report the to authorities instances of Muslims speaking out for Jihad and Shariah law. Both are unAmerican and contrary to the US Constitution. Adhering to the US Constitution is what makes one an American.
Nope. That doesn't cut it. There is only one thing Muslims in America can do to prevent such incidents. Leave. Go back to their crapped-out hole of a country and live like the dogs they are. That's the only thing they can do to prevent further incidents. Period.