Everyone who meets my ferrets immediately falls in love with them! Mine are always sweet and friendly.
There is a lot of misinformation out there about ferrets, unfortunately. They also are not the right pet for a lot of people. I try to talk anyone out of getting one if they say they want one, just because most people have no idea how high-maintenance they are, so many ferrets end up in overcrowded shelters.
People just don't do their homework before getting ferrets (or other pets, for that matter). I didn't know anything about them either when I got my first one 20 years ago, but there wasn't much written about them back then, so I had to wing it and learn as I went along. There is a ton of info out there now in books and on the internet.
99.9% of all ferrets leaving a breeder are spayed and neutered, so even if they got loose, they would not be able to breed if they happened upon other stray ferrets. The average lifespan of a ferret on the loose is about 4 or 5 days. They have poor eyesight and no fear of anything, so get picked off by other animals or get hit by cars. They get imprinted as babies on dry kibble and would be unlikely to know to kill rodents in order to survive (mine have always turned their noses up at any kind of raw or cooked meat). Any lucky stray ferrets who have been found, have been very thin, showing they did not find their own food to eat while out loose. There are no known stray ferret colonies anywhere in other ferret-friendly states, so would not be a threat to native wildlife in California.
OK, off my soapbox!
I know the people who are trying to legalize ferrets in California and are not having much luck. I also know that California has much bigger issues to deal with than legalizing ferrets, so it won't happen anytime soon, altho there are a lot of ferrets out there being kept quietly behind closed doors.