Ugly Fella,
You're right! We pilots have a primary responsibility to be suspicious and act on our suspicions. No, I don't mean be stupid, but when things just don't add up, be conservative and get on the ground SASPO.
Remember that the pilots who diverted into LAX from DFW lost a heap of money in overtime, so it was unlikely to be a silly reason to divert. No, wait a minute, professional standards would make me divert for good reason no matter what the personal financial cost.
Just think of the paperwork!!! Think also of the fact that our pax all walk away from the aircraft to fly another day.