it is merely a reaction.
Yes it is a severe reaction to the disease called AIDS (Acquired Islamists' Deadly Syndrome).
Kill, chop limbs, maim, lash bazi, etc. is the "refined" Islam as practiced by Saudis. And Pakistanis tribals have lapped it up.
May Allah bless the souls of this slain teacher and his father. May Allah send the killers to Jahannum.