Happens in the US as well from time to time. Should we all go to ground and not leave our houses at all?
You have a point. But there are countries where violent crime is a national pasttime. And good luck getting law enforcement to investigate and apprehend the killer. In ratholes like Mexico, the police are part of the gangs.
In the US, there are certain areas you are wise to avoid. Countries like Mexico, you are wise to avoid in their entirety.