"Guns, like automobiles, are evils--but necessary evils."
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My argument is that guns/cars aren't evil...by themselves. Evil things can be done with them, of course.
IMO, an argument could be made of the position that in the threat or use of weapons/guns..more lives have actually been saved than taken.
I think I understand your intended useage of the phrase "necessary evils"...and I will take it in that context.
FRegards,