Oh, you are talking about this new way of angry suicide, where the suicider kills lots of kills or people in malls and then gets killed by cops. Agreed, that is a new thing going on. Thanks for the explanation!That's not a hard concept to understand.
People who commit suicide are in pain, angry, and desperate. They sometimes lash out and take perceived enemies with them.
Not a few mass shooters turn the gun on themselves for just that reason