My 2 cents regarding the poster's original question...
If coming from a first world country, it can take some time (several years) to develop a reasonable understanding of and ability to evaluate what makes for a secure dwelling in the Dominican Republic.
The vulnerability of your home depends on multiple factors including:
- your choice of city
- selection of private home or apartment
- gated or open access community
- visible security measures
- adequacy of security measures
- proximity to and type/character of neighbors
- disparity of economic well-being between you and your neighbors
- perceived value of your home
- perceived value of contents of your home
- perceived vulnerability and perceived risk/reward of targeting your home
- perception of you and whether you yourself are tougher than the criminals
- your lifestyle
- who you hire as household employees
- who you allow into your 'inner sanctum' to get their eyes on what you have and how to get it
Bars on windows definitely have their place. People do not typically spend money on security measures unless they believe necessary. Unless you're looking at the only apartment in a neighborhood with bars, you're pretty safe to assume they 'were' needed. Also, keep in mind many homes/apartments have their windows and doors open 24/7 for ventilation. Without bars on windows and doors it is that much easier to gain access.
Gated communities? You have to evaluate the effectiveness. As mentioned earlier, a manned gate at the entrance only serves to turn away people who choose to enter via that method. If there's inadequate perimeter security, the gated entrance is worth little. It doesn't take much for a criminal to get over a fence or wall.
Also, keep in mind, that by and large you're on your own should their be a problem. Your best hope should you have a break-in while home is calling a big, bad scary neighbor with a gun for reinforcement. The police are only for after the fact... probably hours after.
Make the right decisions and you will sleep well night after night and enjoy living here.
Make the wrong decisions and you risk personal property, your well-being, and may leave bitter and poorer as others have in the past.