I agree, it's easy in hindsight. I'm saying it's not always just a cut and dried decision.

The day after this LAS heat incident, I made a decision to start the APU as soon as I got on the aircraft and pull the ground air because I felt it wasn't adequate in ATL. Just my intuition and experience. I didn't want to get behind the cooling power curve. So I go outside to shut off the air and the ALA starts giving me a bunch of grief. Why am I doing this? Is the ground air not cool enough? He thinks it is. I tell him "No, it's not. Please pull the air now". To which I get another round of the same questions. Finally I just shut off the air power myself and walk away. It was frustrating and I wasn't trying to be mean, I was just done arguing about it.