I agree, it can be hard to determine who is fit for keeping and who isn't even when you meet them in person and have 20-30minutes to talk to them. As a seller though I do spend quite alot of time with people (unless I already know them) screening them before I sell them anything. The "Rather than blame sellers for not running full background checks and blood tests (hyperbole)" is actually a strawman. I do not hold sellers 100% responsible for an animal being mistreated but I do hold sellers (including myself) more accountable then the buyer. I agree though that education can go a long way in prevention of these types of things.