I've had to learn this because letter bombs are a real problem here in Wisconsin. And it's only reasonable to expect that everything you get in the mail could blow up and kill you.
Call me paranoid, but hey, better safe than sorry.
You just like people who plant them. Or people who plant fake bombs to scare the bejasus out of honest people.
I will put it to you this way.
My right to keep and bear arms does not mean that I can walk the streets and point a .44 magnum at random passers-by as a joke.
Not funny.
And the punks who planted hoax bombs are not funny.