No question. But people seem to be under the impression that P.C. is embedded there in the constitution along with the 2A and freedom of worship. Any act of Congress that addresses P.C. even tangentially or unintentionally will override it.However, considering the changes in the Republic over the last ninety years, with a massive expansion of federal power, IMO PC has been a bulwhark against the incorporation of the military into the abuses of federal power. You are right that this is not a Constitutional argument. But that transcends the underlying discussion, as to whether or not it is a good idea to have the military involved in domestic law enforcement.
OK, now you're allowed to read my #111. I oppose changing the principle of posse comitatus and generally oppose changes to the act, although I reserve the right to support "tweaks", particularly those that relate to weapons of mass destruction, which are really out of the realm of typical law enforcement. I don't, however, see any reason to give additional arrest powers to the military. Except where WMDs are involved, the ability to detain until civilian forces are able to arrive is just fine.
I also wish to emphasize that I am much more concerned about Biden's action than Ridge's words. Ridge may have even been responding to what Biden was doing.
But I'm not going to give aid and comfort to the chicken little crowd around here.