Actually, the one's clouding the issue are the ones making fallacious appeals to Levin's authority on this issue. Are you aware of any research he has done into the severability doctrine?
The only thing that really matters is the Case Law on this issue, not what Levin or anyone else says about this issue.
Being a non-attorney, I have to go by
evidence and in this case the evidence is the fact that Congress inserts the "boilerplate" severability clause in every piece of important legislation.
You're telling me that they do this for NO particular reason...since is isn't needed.
Reminds me of Obama spending millions of dollars on attorneys to block access to his birth certificate and other records...as if everyone does it.