Hi, When I was there in January for my son's surgery, One of the biggest murder sprees happened, and I knew nothing about it untill i got back, The clinic and hotel are right on the other side of the border, I never felt like I was in danger, even after knowing about the crime spree, (which happens in all big cities) I still went back in May for my surgery, and again I never felt like I was in any danger.
I never would walk alone after dark and I wouldn't venture off the beaten path. The murders have to do with the police and drug lords.
If your worried, hang out at the hotel, and just take the shuttle to the clinic, I haven't heard of anyone going to the OCC being kidnapped or murdered.
good luck with what you decide.