One wonders how the holiday flight operators are handling this, the TUI/Jet2 etc people. Clients stuck in the security queue - do you go and leave them behind, where you maybe only serve the destination once a week ?
And for the Ryanair/Easyjet/mainstream scheduled people, where does responsibility start. If you have presented at the check-in when still open for your flight, put your bags in, but then are hours in the security queue, can the carrier just go, as you have been accepted ? You have paid all your money to the airline, it is their responsibility to manage their elements; their fuel supplier, their staff, and their airport provider.