What this column does is whitewash evil and graywash good. The left's position is to use government force to violate the inalienable right of individuals to own firearms. Any step they take in that direction is illegitimate, because the laws are already way, way too restrictive, and all regulations are illegitimate.
The right's position is not that people should use their guns to prevent others from voluntarily "making no contribution to society at large," whatever that means. It is that we have a right to peacefully own and use guns without interference by the government.
There is a night-and-day moral difference between these two positions. The left's position is morally bankrupt. It is morally untenable.