Devils advocate here, but the conflict doesn’t sound like it’s due to the fire fighting aspect of your job, it’s the business inspection end of things.
Imagine telling our customers that we are raising our rates for window cleaning by double. Oh…and by the way, we’ll be by to do the fire inspection on your property soon after. Hope you pass…
You would t do that, but google inspection corruption and I bet you find some interesting stories. Health inspections, building inspections, etc.
Read your contract with the union and do your best to abide. It’s the only ethical thing to do.