Why is there opposition to gun locks?

Why is there opposition to gun locks?

Larry Pratt (Executive Director, Gun Owners of America) gives expert video advice on: What is a gun lock?; Do guns come with a safety lock already?; Why is there opposition to gun locks? and more...

Gun locks are dangerous. Gun locks make it easier for criminals. Gun locks don't keep guns from being stolen. Other than that, I guess they're fine.