[wimpycat]

A firing squad may be messy, but there's far less chance of something going wrong, and it's quick; therefore, more humane than hanging or the electric chair or the gas chamber.

[Willie Green]

but there's far less chance of something going wrong, and it's quick;

I'm not so sure about that...
not when they pin the target over the heart...
Yeah, that'll work, but no doubt it'd be quicker and more certain with a head shot.