They are both correct because they are talking about two very different scenarios. There are two distinct classes of thieves out there with two very different objectives - (1) amateur smash (whether it be the glass, the door handle, etc.) and grab thieves looking for a quick score by stealing valuables, and (2) professionals that are there to steal the vehicle. I was the victim of the latter in Houston a few weeks ago. The whole thing was on the hotel's security video. It took them less than 3 minutes. They clipped the horn wire, got the door open (don't know how exactly, that part was hidden in the video, but it took them less than 15 seconds), and then programmed a blank key fob.
Not leaving valuables in the vehicle, especially visible ones, is a no brainer that obviously always applies to both scenarios, and
@rfc805 is correct that it will help deter (but not completely prevent) the amateur smash and grab *********. As I've researched this more and more over the past three weeks, I've discovered and firmly believe that
@JohnyPython is onto the best solution. You absolutely have to move or secure the horn wire so that the thief can't cut or unplug it. If the scumbag thief (especially the professional that is trying to steal the Raptor) can't operate discretely from the very beginning, in almost all cases, they'll move on. That said, the professionals are getting into the vehicle by hovering, scouting and stealing remote codes, and then later unlocking the vehicle with what the truck believes is from the owner's remote, so in that case the alarm does not sound. That's where the Ravelco comes in. Once they get in and see the Ravelco (or program a blank fob but it won't start because of Ravelco), they are going to move on virtually every single time. Again, if they can't steal it, in silence, in less than 5-7 minutes, they're moving on to another one.
The Jimmi Jammer, passenger door, etc. solutions may be effective in preventing that particular entry point, so they may deter some of the smash and grab punks, but many of them will just pierce the window in a more quiet manner as the poster from San Antonio noted above. These measures will have very little effectiveness on the professional who is there to steal your Raptor in 3 minutes.
My gen2 is no doubt flying all over the Mexico desert mule'ing drugs and being an accessory to cartel crime. My wife jokes that it (my Raptor) really just wants its old life back - sitting clean and pretty in a climate controlled garage 6 days a week.