Couple of factors (IMO):
1. The public has, by and large, accepted the presence of replay review in football and cannot or will not understand why baseball isn't following suit.
2. "knowing the rules of baseball" is something that every American assumes is ingrained by DNA, and it is an affront to man (woman)hood if they are proven wrong. The same people who will patiently listen to explanations of arcane football rules with an open mind will be greatly offended if their cherished (false) notions about baseball rules are exposed.
No other sport is quite like this. Just like that great "That's such a balk!" Bud commercial clip..."ummmm...well. There's a pitcher, see? ..and....a runner....ummmmm"
