It's been a long time since I have visited a scuba board... We went to Bonaire 10 years ago (I don't remember the exact year, but it was pre-Lenny), and it seems the problem has gotten worse, if anything, rather than better. While we didn't get anything stolen, we decided not to go back until the island decides to take care of its crime problem. When we went to Saba a few years ago, not only were we told there was no need to lock our hotel rooms (I'm not even sure if we were given room keys), but we were instructed to leave our BC's, regs, and dive computers outside our rooms when we went to bed at night so the dive shop's truck would pick it up in the morning and have it ready for us on the boat.
Given the size/population of the island, it's obvious that the local police are at best allowing these crimes to happen, or, more likely in my opinion, in cahoots with the thieves. IMHO, diving in Bonaire isn't so unique that no alternatives exist. These thefts will in all likelihood continue until the diving community gets together and decides they will cease supporting the island and its criminal unit.
If divers stopped coming, the local government would get the message, and the thievery could be stopped in a matter of days or weeks at the most. The notion of blaming tourists for getting their windows smashed because they lock the doors seems silly to me. I've never heard of anyone being offered these stolen items for sale, so there is obviously an organized system of selling off-island, of which I'm sure the police is fully aware.