O'Leary has his own agenda but if nobody would do any measure that isn't 100% effective we know now that the health service would be overrun and instead of the 10% of CoVid19 patients dying that needs it, it would be 20 or 30%. Quarantine depends on that the sensible 80% of the population follows it. The last 20% there is little we can do with except locking them up for the duration of the pandemic. Most effective way of policing the rest is naming and shaming they who brake it, like Cummings. If Ireland has a 14 day quarantine and O'Leary travels abroad and is swanning around on the golf course when he comes back, hang him in the press. Then hopefully most will stop following his advice on most matters, and others like him.
The best way for the airline industry to get back to something aproaching normal is not by throwing caution to the wind and getting everybody infected. As far as is confirmed less than 4% of the population have had CoVid19. and that leave a lot more to go. Not taking precautions will just create wave after wave and that will not encourage people to travel. And that includes those precautions that inconvenience the travel industry, including airlines. Some precautions might god forbid even cost Ryanair money even though they try their damndest to push those over on the airports.