Has Anyone Added a Deadbolt to the Bottom of the Door?

That just means more damage to repair when they pry the door open.

Locks keep honest people honest. Small crowbar and no care about damage and I'm certain I could get your door open in under a minute even with the extra dead bolt...plus I won't find out about the dead bolt until I've jammed the crowbar in and gave it a few good yanks destroying the door and door frame.