Most burglaries happen due to people leaving windows and doors unlocked. The burglar just walks right in. Beyond that, they kick in doors, or use the items in your yard (ladder, trellis, large rock, hide-a-key, etc.) to break into your house.
Most front doors on most houses and apartments are installed with very short screws that only go into the door trim, not the heavy frame.
So almost anyone can kick your front door in--it doesnt take a lot of strength or skill.
This kind of lock adds another layer to that, and gives you more time to react. Even if someone bumps your locks, they wont be able to open the door. This also keeps out uninvited landlords and maintenance workers.
Get this for you and your family you wont regret it.