It actually does happen that it is the gun's fault, in case the gun has been abused or there is a design fault. But the probability is small.

The issue here is that C is written specifically to allow you to shoot yourself in the foot if you want to. It is a language where you don't have to spend half the day just to figure out what work-arounds it will take to get the compiler to accept something tricky. Just as in assembler, you can do a huge amount of dumb things in C. But the higher abstraction allows the C compiler to issue warnings when you are overly clever.