Most people in first world countries have a very different idea of "safe". First world country houses do not have bars on the windows, the yard may not even have a fence, a hotel that looks good from outside is usually a good bet inside. Most protection mechanisms are intended to keep the honest person honest.
When such people travel into the a third-world country, their parameters of "safe" need probably to be a adjusted little bit.
What are some of the safety related changes one one should be be congnizant of when traveling to a third world-country?