Not sure what your saying, if the pope thought crossbows were bad, therefore they are ? The point is, any weapon is designed to inflict damage that ordinarily wouldn't be possible without putting yourself in great harm. If I carry a sword I am giving myself an advantage those without don't have, if I carry a bow and arrow, I am giving myself the ability to kill a person from range with limited danger to myself, if I throw a spear I am limiting the damage to myself and inflicting damage on an enemy that I couldn't do with my hands.. Does any of these things indicate cowardice ? Not at all, it's simply sensible to remove the enemy threat with limited danger to yourself.
While the mechanism of delivery may have changed throughout the ages, the purpose has remained the same.
Flying a plane remote control is no more cowardice than throwing a spear, using bows and arrows, crossbows, cannons, artillery, or whatever ranged weapon you care to think of.
When it comes to war, ethics is something debated after the event, every advantage is used during.