RadicalIslam.org has recently published some extremely serious articles documenting statements by American Muslim groups and individuals (including by a respected imam) which make it clear that armed jihad is the goal once Muslims in America have gained sufficient strength in numbers and arms:
American Muslim Jurists: Offensive Jihad? Not Yet.
Imam Preaches Armed Jihad in D.C. High School
'Nuanced' platitudes about Islam by academics and clergy never seem to address these sorts of initiatives, which spring directly from Islamic doctrine, which is of course based not only on the Qur'an, but on the life and example of Muhammad, as handed down in the Sira (Life of Muhammad) and the Hadiths (sayings and traditions by and about Muhammad).
