The only theft we have ever been personally aware of in more than 7 trips, was one pair of inexpensive sunglasses swiped from the truck we were sharing with another couple. There is a problem with theft from rental trucks, parked at some of the shore diving sites, but unless you are foolish enough to ignore the warnings on not leaving anything of value in the parked truck, it is easy to avoid such issues.
THAT is the typical theft problem on Bonaire, and mostly the type of crime visitors have encountered on the island, but there have been thefts from rooms on occasion, and you do have to take all the same precautions you would in any hotel, even her in the States. Be alert. Do not leave valuables exposed to create both opportunity, and temptation. Lock doors and windows when you are away, or when you retire in the evening, just as you should anywhere.
What theft Bonaire may have, is at least nothing like the violent types of crime you might encounter on certain other islands in the Caribbean, or again, here in the States.