Good point, hadn't thought of that scenario. It doesn't sway me though.

But perhaps it isn't right to place the marshalls on the flights unknownst to the passengers, if some people do have objections to this sort of security they probably shouldn't have it thrust upon them.

But the only way I can see around that one, is to sell "marshalled" and "non marshalled" flights. And that sounds awful, but would give people a choice.