I think it's harsh to call these people stupid. You dont even know them. Certainly it's fair to say they are ignorant. Discussed or not, if it's new territory for them, the conversation may be a blur of half rememebered requirements. Written care sheets are a lot better. Also, people may not see the harm in deviating just a little bit from the prescribed care. "So my hot spot is 75 not 80...what's 5 degrees anyway?" This also doesn't make them stupid...just ignorant.
Sounds like you are helping to educate them out of their ignorance through further conversations about husbandry. If they are correcting their mistakes then they are trying to learn from you and do the right things now. This could work out for all concerned.
1 adult bull snake: "Dozer"; 1.1 juvenile bull snakes: Oscar and Phoebe; 3 baby red-sided garters; 1.1 macklot's pythons