Be some nice ammo for a prosecutor should you have to defend your home with deadly force.
Many criminals are smarter than you think, they take the time to case a house and learn when no one is home...why advertise to these dirtbags you have one of the most desirable theft items in your home?
If I were a criminal...that'd also be a tip-off to me that there's a high chance of there being firearms inside.
I'd then just wait until Mr. and Mrs. aren't home.
But... I'm not a criminal....