I would say being prepared to put down a snake you produced should probably be a prerequisite to breeding snakes at all. Odds are, a pairing from two healthy snakes with no known genetic quirks in their makeup, will produce healthy eggs, that produce healthy babies when those eggs are incubated correctly. But things can sometimes go wrong anyway. Equipment malfunction, human error, or just plain bad luck. Snakes can come out deformed. Snakes can come out with potentially life threatening, but treatable conditions like a twisted umbilicus or "hard belly". If you plan to breed your snakes, you gotta be prepared to handle the not so nice stuff that comes along with the fun bits of getting to hatch and raise cute baby snakes.