[Boeing Guy]

How many planes have been built to kill, compared with those designed to carry passengers.

Okay :
312,000 Active General Aviation Aircraft, including Business Jets. 17,770 Passenger Aircraft 89,129 Military Aircraft 26,500 Civil Helicopters 29,700 Military Helicopters.
According to Flight International in service today worldwide.

How many firearms have done humanitarian good?
You cannot win this discussion, weapons are primary designed to kill, end of.

Retlaw
What do you mean, that we should call then Ice Cream Cones?
By their proper names, Muskets, Rifles, Pistols, Revolvers, etc, guns are smooth bore fire arms.

Sorry to be pedantic, but:
gun


Pronunciation: /gʌn/
noun

• a weapon incorporating a metal tube from which bullets, shells, or other missiles are propelled by explosive force, typically making a characteristic loud, sharp noise.
• a device for discharging a particular object or substance in a required direction: a grease gun
• a starting pistol used in athletics.
• the firing of a piece of artillery as a salute or signal: the boom of the one o’clock gun echoed across the river
• chiefly North American a gunman: a hired gun
• British a member of a shooting party.
• (guns) Nautical slang, dated used as a nickname for a ship’s gunnery officer.

Oxford Dictionary.