Andy and DR,
You do make a valid point, and one that I have considered for myself. The chances of someone randomly locking you in are remote, but the fire safety factor needs to be considered by each owner prior to making such an install.
-Do you have a reliable second or 3rd exit?
-Do you know where it is?
-Do you know how to use it or break it out?
-Do you have a working smoke detector?
-Are you calm enough in an emergency to think clearly and take appropriate action?
I have satisfied these questions in my mind and am satisfied that I AND my family can safely exit the trailer by more than one means.
While I don't wish to test this on MY trailer, I also believe that I could "Donkey kick" the door hard enough to pop the rivets out of the latch. In my line of work I get the "opportunity" to try these types of things out occasionally.
I agree that this lock may not be for everyone for safety reasons, but I like it and will use it until I'm no longer comfortable with it due to safety questions listed above.