I think the chances of a mugger strangling you with your neck knife cord are pretty slim. However if you work around machinery it is not a good idea to have a solid cord around your neck. A cord around your neck is a bad idea period. You can get hung up on tree branches, door knobs, or furniture. There is a reason military ID tags are worn with a break-away chain. Imagine a soldier wearing 20 pounds of gear dismounting from a vehicle and getting a 550 cord necklace caught on part of the vehicle.