We don't lock the 2 mortice locks at night because if we had to get out in an emergency we'd have to locate the key, and it'd slow us down. Also I attended a talk by a police officer once and she said she used minimal locks on her doors because she'd seen emergency services too many times unable to get in because of excessive locks. My dad, however, thinks the house is insecure at night, and also thinks the single mortice on the back door isn't enough.
Any thoughts?