Even if it is theoretically possible for the client to mount a defense against deportation in immigration court, his or her family may be unable to afford it.  Particularly if the client is in mandatory detention, and thus unable to work, the family may not be able to afford the cost of an immigration bond, and an immigration attorney, and still keep the family afloat economically.  Half of all immigrants in deportation proceedings are unable to afford immigration counsel to defend them, and there is no right to court-appointed immigration counsel in deportation proceedings.

Seventh Circuit

RELIEF " CONVENTION AGAINST TORTURE " DEFERRAL OF REMOVAL " JUDICIAL REVIEW
Wanjiru v. Holder, 705 F.3d 258 (7th Cir. Jan. 11, 2013) (court has jurisdiction to review denial of a request for deferral of removal under the Convention Against Torture; INA 242(a)(2)(C) does not bar review).