Nobody posted any slogans until you did. It's perfectly reasonable to reply with civilized discourse.
Unilaterally proposing a single solution to a complex societal issue while insulting dog owners is problematic and does more harm than good. "Adopt and shop responsibly" doesn't offend anyone who bought a dog and might make someone ask, "What does it mean to shop responsibly?" instead of buying a dog on Craigslist. Dogs deserve more respect from people, which requires treating all people with more respect.
Breeders will always exist, and so will their customers, as they always have. If it's only financially viable for breeders to be held accountable for their actions, that's another way of keeping dogs out of shelters. I'd rather live in a world where breeders always adopt their dogs back, always ensure they find a home instead of overwhelming shelters, charities and communities work together to make owning dogs more affordable so they don't get relinquished during financial stress, AND shelters exist. In a world where shelters are the only hope for dogs, dogs are left behind.