So, imagine that you absolutely MUST have the current job you are working (to raise kids, pay off your loan shark, rent, whatever). Would you tell people the "right way" to keep every animal they sell and risk losing your job because you are driving away customers? If you answer "yes" then you have probably never been strapped for cash (where you have $5 to last you a week and a half) or have never needed to find a job NOW.
Sure, an employee could do research about what they are selling, but would you honestly research that far into your job when the company gives you "perfectly good" literature on the subject? Very few people will delve that far into a job they have no intention on working their entire lives (as is most of the people working at petstores).
Whatever happened to "buyer beware?" There needs to be more responsibility put on potential pet owners than there is on the employees. Besides, if an employee sees the store keeping their animals a certain way, why should they think it is wrong for other people to keep the animals that way?
Heat rocks are no better or worse than UTHs. Heat lamps can be used as well. Just because it is not the "best" or most accepted set-up, doesn't make it wrong or bad.
I'm not going to fault employees for regurgitating information they have been given. A responsible pet owner should know what they are doing BEFORE purchasing the animal.
*On a side note: There was an ad in the paper for "Bull Terriers: the Target Dog!" IMO, if you have to tell someone what the breed looks like, then they are ready to take on that type of dog.*