Yes, thanks, you are correct. It's not good to throw the baby out with the bath water.Your point is well taken.
Unfortunately, this does not change the fact that LFS generally are a bad place for advice. The number of LFS where good advice is given is relatively low. Naturally, the LFS members here are exceptions to this general rule, and will give excellent advice. I think this goes without saying. Members need to understand that unless they are shopping at a member LFS then the odds are stacked against them in terms of advice.
I'm sure that our member LFS are all too aware of the problems of bad advice in the hobby, and, as you mention, they strive to understand the truth in order to provide a better service to their customers and to undo the damage done by their colleagues in the industry.
It might actually be a better idea for our LFS members to network in order to organize an education program for those recalcitrant LFS. That might be an even more effective strategy.
I apologize for any inconvenience in making such a sweeping statement, but there is no way I'm going to sugar coat the truth, especially when we hear horror stories such as that listed by the OP, and when we have to spend the time and energy to help undo that damage.
Here's another tip: The OP should be given maximum credit for now discovering, and accepting the truth, despite how painful it must be.
I have no problems with adding the caveat that member LFS (and probably a small percentage of other LFS) are an exception to the general rule of bad advice prevalent in the industry.
Hope this helps!
Cheers,