I'm sorry, but as SLF I'm struggling to understand what the command and response is to ATC directives. ATC accepts the aircraft for landing, assigns a runway, etc. and directs the aircraft into the landing pattern. At what point does the PIC take over decisions as to whether the landing should continue? How can the pilot ignore specific (sounds to me) direction from ATC to take another heading and circle and decide on his own to continue the approach? Sure, the pilot is in command of his aircraft, but it would make a lot of sense to me that a command (turn left 180) is not a request but an order. Can the PIC just ignore direction from the ATC? Then what are the ATC there for? Don't they know much more than the landing aircraft as to what is happening around the airport?