How many times has there been a Bus in pakistan or van full of sunnis gunned down in broad daylight ?
0
How many times has there been a shias killed en masse ?
Several times.
A quick google search will reveal since 2010, shias have been targeted in 3 diff ways :
1. A drive by shooting of several key leading shia figures like famous doctors, Judges and lawyers
2. Mass gunning down of shia religious processions.
3. Mass circulation of warnings to Shias in areas like balochistan, Quetta, Gilgit etc.
If someone thinks there is no concerted effort to eliminate pakistan of shias they are either stupid or intellectually dishonest !