I've seen posts of people discussing the need for battery kill switches and gas cut offs. Most Jeeps are wide open with no alarm, chip in the key, etc.
I have a few Tuffy products to safely secure stuff in the Jeep, none of which is any good if the whole thing is driven off.
I know if a thief really wants it, they will get it no matter what. Seems to be a lot of concern though, are Jeeps that easy to jump in, hot wire and drive away?
If you discount physically grabbing onto it and hauling it away with some type of wrecker or tow rig, it depends on the existence of the Sentry Key system.
Without it, takes a few seconds to pop the ignition cylinder out and actuate the starter switch with a screwdriver which also unlocks the steering wheel.
An accomplished amateur could have it gone in less than 2 minutes.
With the SKIM system from the factory in place, it is much harder and takes much longer. Even if you know the rig, you will need a non SKIM enable PCM. Before you swap that in, you have to access the SKIM module on the column and unplug it. After that, it takes about the same amount of time as the one without.
Unfortunately, me seeing someone in a parking lot with the hood up messing around over by the battery and then messing around under the dash would not raise many red flags.
I've seen far too much cobbled together wiring so I would just figure his 10 gigawatt sound system he was powering with the ignition accessory fuse that he got from Harbor Freight finally overloaded the wiring which let the magic smoke out and I wouldn't even give it a second glance.