If it sells more tickets let them carry guns.
I speak as a frequent traveler in premium cabins, e.g. one F last Thursday, one J the day after tomorrow and about 100 sectors per year.
If I think that guns may be carried on a flight, then I will avoid it.
I am not criticizing anyone in this thread, you are all entitled to your opinions, but ultimately I have the right to choose my airline, as do others, some of whom may positively choose to travel under such circumstances.
As a former competition shooter (.45ACP), I do have some insight into handguns and am not a knee jerk "anti gun" lobby member, but I don't feel that carrying in the flight deck enhances safety and would prefer them somewhere else, in the same way that guns are kept out of prisons.