I'm glad the OP posted this article to remind of some of the complexities of C (and C issues in C++) development. However, to coerce some of the bad examples OP

I'm glad the OP posted this article to remind of some of the complexities of C (and C issues in C++) development. However, to coerce some of the bad examples OP used casting. This breaks the larger claim. A proper example of the issue would start with a bonafide int* word aligned and get to a non-aligned access without casting. Others mention packed v. non-packed structures ... this seems a more likely way to shoot yourself in the foot.