"...if he's broadcasting illegally, why wait until the next day?"
They, like all inspectors usually schedule inspections and notify of the date and approximate time of those inspections. Normally they may inspect during business hours and usually do, but legally they may inspect ANY time the station is on the air.
"Yes, they are really getting serious; seriously stupid for chasing a Chicken Bander running 150 watts."
They weren't chasing a chicken running 150 watts, they were chasing a chicken deliberately interfering with another chicken. They didn't even know about the leenyars or how much power the one they tested was putting out until they found them during the inspection. Don't put the cart before the horse, locomotives can push trains, horses can't push carts.
"Seems the FCC was not too anxious to go into the Bronx."
Roger Nye The FCC Guy was stupid but he wasn't crazy. He tried to screw an N connector into an SO-239 and measure the power of a CB set with a Bird 43 having a 100W 450MHz slug in it, but he wasn't crazy enough to mess with the gangsters surrounding Fort Apache.