I don't understand this at all - six trips and over 100 shore dives there and I have never needed anything after a dive but vehicle keys. EVERYTHING ELSE IS OPTIONAL not required. It's not that far back to the room (unless you dive up in the park).
I completely understand it. While I suppose it's possible to drive around with only your dive gear and what can fit in a small waterproof case I actually don't consider that at all reasonable. When I go on vacation there is a certain minmum level of comfort I want. When we go to Bonaire we stay in a condo 10 minutes south of town so doing sites like Bari Reef or further north (but still not in the park) means a 15-25 minute drive and back and forth through town. While I guess I could always head straight back to the condo after a dive it's convenient to stop in town for a drink, ice cream, groceries, etc. So for me I consider a bare minimum level of comfort to have:
1. Flips Flops. I don't like driving barefoot and I don't want to walk in town or the grocery store barefoot, and I'm not walking around in wet dive boots.
2. T shirt. I'm not going to wear my wetsuit to the dive site and I'm not going to drive around without a shirt and definitely not going to stop in town without one. And even more than me absolutely no way is my wife going to wander around just in her bathing suit.
3. Towel - I suppose in 80 degree weather I could rinse my face with my water bottle and simply not dry it, but a towel to wipe down with after a dive is a minimum for me.
4. Sun Glasses- the sun is bright in Bonaire. I'm not driving or walking around without sun glasses, and my eye doctor doesn't want me to.
I'm pretty sure my wife would add as her minimums a hair brush for after the dive and sunscreen lotion.
Now having said that I can say that in 3 trips to Bonaire we've always left those things in the truck and they have always been there after the dive. As others have commented we do so by bringing older items that would be no big loss if they were stolen and I suspect even the poorest thieves recognize the minimum value these items have.
I'm sure theft occurs in Bonaire, I'm just not sure how prevalent it is. I will say that if the theft problem ever does get to the point where I can't bring crappy old items of the kind I mention without them getting stolen after every or even just many shore dives then I would have no interest in returning to Bonaire. The diving on Bonaire is very enjoyable, but it isn't that great and there are plenty of other enjoyable dive locations.