V'Yikrah 5771-Questions We Should Consider About the Muslim Hearings

I was not alive for the McCarthy hearings, but they seemed to have the effect of turning Americans against Americans which is something most would consider un-American.  Our country has put itself forward many times as one of the places that upholds freedom and justice, thus I found it disturbing to hear about the proceedings conducted by Rep. Peter King this week.  Even more ironic that most scientific data shows that such hearings are not focusing on the real threat as was reported on NPR's Hear and Now.  So why do we need to have such hearings?  Are they about facts...or is there something deeper at work...and what might that have to do with a Torah portion about sacrifices?