Ryanair Photo ID
Is it not pretty obvious that Ryanairs poliocy has nothing to do whatsoever with security but is simply another way of boosting yield-revenue?
Having denied boarding to some unfortunate who has forgot or brought the wrong ID which in the recent past had been perfectly acceptable Ryanair will keep the cost of his ticket and then sell the same seat to another person who is on standby i.e. double revenue for one seat.In addition to that Ryanair will then probably collect a third fare when the poor unfortunate books on the next flight.
Good business practice eh?