Gun control and Congressional logic

If Congress passes a gun control bill that exempts themselves from the restrictions imposed by the bill, what possible rationale would be appropriate for them to legally purchase assault weapons outlawed in the bill?  Why would the rationale used by the Congressional member not be just as valid for any citizen of the United States?  If it is simply because they are Congressional members, would that not be a law enacted only for the defined privileged?  That would be a blatant form of gross discrimination.  It seems that would finally be Congress defining themselves as Washington elitists.

Jim Killebrew