They're not going to have to break into it if the doors are fucking unlocked. Jeeps with soft tops are much easier to break into with locked doors than lets say, a toyota camry.
If someone has the intent of breaking into someone's car, chances are that they're going to try to open the door first. If you leave your doors unlocked on a soft top jeep, they won't have to cut your top. Now that they're in your car, as long as all your shit is locked in the glove compartment, they'll most likely leave without doing any damage.
If you leave your doors locked on your soft top jeep, someone with the intent of breaking into a car is going to see your car as a golden opportunity because of how easy it is to cut the soft top. Even if all your stuff is locked away, you'll still have a cut top, which most likely wouldn't have happened if you left your doors unlocked.
And being on different sides of an argument about how to protect your car from robbers hardly merits a reality check...