Viewing the 2nd Amendment as a privilege works for those who see the U.S. Constitution as a living document that needs to be perfected, rather than a legal document that means just (and only) what is stated within. It starts there, then the other guaranteed rights are also privileges that can be abridged, or eliminated.
“... the right of the people to keep an bear arms shall not be infringed.” So easy even a democrat should understand!
Personally, I have no problem viewing the Constitution as a "living document": No part of it is fixed for perpetuity, but is always subject to revision BY AMENDING IT.