Passenger Ashworth made a remark that was not particularly funny but neither was it particularly offensive. He committed no security breach and was refused carriage because some security and airline personnel were unable to decide when outrage is appropriate and when it isn't.
All aviation industry staff who react in this somewhat excessive manner are, unfortunately, venting upon these hapless (and in some cases misguided) individuals the general sense of horror and outrage felt by us all following September 11.
Now, more than ever, cool heads should prevail. Take the individuals aside, speak sternly to them, let them know their comments are not appreciated by staff and may not be by other passengers. Then wish them a happy flight and put them back in the line (or in their seat). Lashing out unecessarily will ultimately do more harm than good.
Even if Mr Ashworth could be described as unwise or silly, his purchase of a fare is still a valuable one.