@npole
I don't think we are fear mongering or anything...The OP has not been before and has a lot of questions so we want to ensure he or she is armed with information to make them feel comfortable and aware. It has happened and is documented so I think it's still fair to bring up and mention. Whether how, when, where the OP decides to use ATMs (or if at all) is up to them after we share information and experiences. Cozumel, Cancun, or Mexico aside, this happens in all countries and it's always good to travel smartly. I don't know the extent of the OP's travels but perhaps this is also their first international travel. It doesn't hurt to give a little more information.