Probably every organization in the world has active members that do not have America's best interest in mind. I guess if being a member of a particular organization would help me to have access to information and/or the exchange of ideas that would help me better understand and/or better influence policy decisions (at whatever level -- corporate, city, state, etc.) then I would consider being a member even if other members of the organization held ideals that I find unacceptable.
OK.
The mass hysteria over a think tank would be funny, were it not so sad.