More then half of the shootings I ear and read about the "victim" goes to the hospital and gets "treated for gunshot wounds". 2 in the chest is usually the "victim was pronounced dead".
The first sentence is undoubtedly true. In most cities, more than 80% of people shot with a handgun survive. In some cities that number is as high as 95% survival rate. Handguns are not that efficient at killing people.
Your second sentence is not necessarily true. Granted that two in the chest are more likely to kill someone than two in the big toe. However, people with multiple shots in the chest survive all the time. See above.
Good thing that the ultimate goal is to STOP the assailant, not necessarily to kill them. Handguns are very good at that.