I am always amused by these feats of mathematical prestidigitation that strive to ‘prove’ that seventeen deaths really aren’t important.

“If it saves one life it’s worth it” is an inherently fallacious argument. Even writers heavily in favor of gun control realize this:

Why 'If We Can Just Save One Child ...' Is a Bad Argument

And of course, that extends beyond gun control and into all areas of policy discussion.