It is said that one of the reasons that led Alberto Santos-Dumont to commit suicide was the use of airplanes in warfare[1][2].

I wonder if anyone believes that the world would be better today if we didn't have airplanes, even if they are sometimes used to hurt innocent people.

[1] https://en.wikipedia.org/wiki/Alberto_Santos-Dumont#Death

[2] http://global.britannica.com/biography/Alberto-Santos-Dumont