If you can save even one life...

I've heard this line too many times recently, and it showed up today in the president's speech as he talked about gun violence.  If we can save even one life by taking this action, then we ought to do it.  If that were true then we would have a national speed limit of 1 mph, since that would certainly save at least one life.  It's not like we have a right to move fast, so why don't we have a national speed limit?  Because at the end of the day we do value some things more than someone's life, even the life of a child.  If you can save even 1 minute of rational thought, you'll never use the "save one life" argument again.