Ahmadis have murdered before.  The 1937 murder of Fakhurridin Multani comes to mind. Nonetheless, as we all know, there was a peaceful protest walking past an Ahmadi mosque when some Ahmadis opened fire and murdered a Muslim man and injured 2 others.  Read the official Dawn news report here.  

Ahmadis then spread propaganda
Ahmadiyya leadership knew about the planned protest.  They didn’t care about the loss of life. They saw this entire scenario as an opportunity for more asylum cases.