INS can not deny your cases without a good reason. If they deny your I-485 simply because of WOM, you can appeal, and they will be fired.
Recently 8 US attorneys were fired already for their wrong doing, that should teach them a lesson. Even Mueller is in trouble:
Gonzales, Mueller admit FBI broke law
http://news.yahoo.com/s/ap/20070310/ap_on_go_ca_st_pe/national_security_letters
You should not give up, at least fight to discovery stage.
There are some good cases out there which you can use for your objection to "Motion to Dismiss".
The order from judge is great source:
Case 3:06-cv-02458-EMC (No. C-06-2458 EMC)
UNITED STATES DISTRICT COURT
NORTHERN DISTRICT OF CALIFORNIA
Filed 01/08/2007