And whom am I defending against?
So no public servant has ever flown business class paid for by the state or out of their own pocket? I think we all know that's a long way from the truth.
Regardless, people who work hard for a living are entitled to spend some of that income on a perk such as this now and again, including public servants. Them doing so has no bearing whatsoever on the other issues you mention, or it being right and proper for us all to demand efficiency from that public service.