I don't support the ban of Muslim Brotherhood or of CAIR in the US but...

""As Sussan Siavoshi, a political science professor at Trinity University in Texas, puts it: “If Cair, a civil society group, becomes designated as a terror organisation, what are people’s options if they want to become involved in politics? Some may become inactive, but others may start underground violence or movements.”" This is a wild overstatement.  Surely Arabs in the US have options beyond the organizations which are sponsored by Gulf regime embassies. Come on.  (thanks Rania)