Traffic is er was or someone else able to post the law referred to here?
It's not actually, it's the airport operator who is required by law to apply and enforce access control, so it is up to them to decide if your reason is legitimate or justifiable.
I cannot imagine a police officer removing me from airside as a pilot bearing an ASIC. More likely the airport officer calling the police in to enforce such a law (if it exists) would likely find him or herself looking for a new job in the near future.
Awol57
The regs actually state Lawful reason. I have no idea what the actual definition of Lawful is, but I am sure there is a definition somewhere
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Law can be complex but I would hazard a guess that it would mean something that in itself is not illegal.