In my experience people are, not unreasonably, very likely to defer to their local fire department over their local planning department on fire safety. As practitioners and advocates it should be a priority for us to engage and bring along first responders because they are and, quite frankly, almost certainly always will be a group with higher public trust than we are. We're not going to win a public debate if the fire department is arguing against us, even if the data backs us up.
EDIT: Basically, we can't expect everyone to be familiar with building code practice in other parts of the world.