They are dilutes carrying recessive genes, their is debate if silvers are even full blooded labs. People who breed for these colors have a complete disregard for the dogs working ability. They are breeding two dogs that carry recessive genes to get these genes. Health, soundness, and working ability/drive be damned.
I am going to have to disagree with you on this one. Most maybe but not all people that are breeding these dogs are just worried about color. I currently have 2(male and female) of these so called silver labs. Both of which hold a SH titles and health clearances. They are some of the best hunting dogs that I have had a pleasure to hunt with.