To play Devils Advocate for a moment - not all puppy farms are bad - just nearly all! I have visited one which seemed to be doing a good job for all the animals young and old I must admit I could not find fault.
Me, my first reaction to your post was one of " I cannot disagree more", but after a bit of thought here is my view. I know a fair bit about this issue as I support CARIAD and have an rescued puppy farm dog myself.
Firstly, the term "puppy farm", or "puppy mill" as they call them in USA, can be a bit misleading. There are good and responsible breeders who breed more than 4 litters of puppies a year, so they do need to be licensed but I would not describe them as puppy farmers, and neither does CARIAD. I am positively not against dog breeding. Im a dog lover so of course dogs have to be bred otherwise I couldn't have one as a pet. This isn't about responsible dog breeding.
I would describe a puppy farm as a place where dogs are treated purely as breeding machines, where they get little if any human contact, are not socialised, receive little veterinary care and are simply tools for profit. And I don't think that there is any way that such a place can be said to be even OK, let alone good. So, Me, I sincerely hope that the place you visited ( they don't usually encourage visitors tho) was not one of those.
My dog was in a puppy farm in Carmarthenshire for her 1st 5 years. She will have been mated in her 1st season and bred from twice a year until the size of her litters dropped to an "uneconomic" level. If she hadn't gone to a rescue at that stage she would have been summarily dispatched. Don't be under any illusion that a vet would have gently put her to sleep; that costs the puppy farmer money he cant recover.
Our dog came to us 4 years ago as a very underweight nervous wreck. She is still afraid of nearly all humans, loud noises, doorways, gates, sweeping brushes and feet. It took her 3 years to learn any sort of house-training and even now is not reliable in that. She is now obsessively attached to me, to the point that she has separation anxiety; but at least she trusts one human being so we forgive her this.
I cannot tell you how many tears I have shed over this poor damaged dog and the nightmare life she led.
Would I take on another ex-puppy farm dog? Yes; in a heartbeat. Why? Because until our useless/grasping/waste of money MPs show some compassion and ban puppy farming someone has to help those dogs who actually survive their wretched years in slavery.