Well if it weren't for responsible breeders there would be no one to maintain healthy genetic diversity or to preserve rare breeds. There would just be the rabbit mills, irresponsible breeders (also known as backyard breeders, but I don't like this term), and accidental pregnancies.
I do agree that that phrase is silly - it's too broad - but I agree with the sentiments of it. Responsible breeders are so undervalued.