Well first of all I condone these attacks, I don't care if one is shia or one is sunni, that's how they were born. Let me just clarify that so no twisting words goes on here. These minorities are prone to attacks by JMB and all the other rubbish because they believe these are deviant groups.
Was there a such thing as sectarian violence in Pakistan before 2001, maybe even 2004? Shias in major cities lived peacefully. All hardliners hate something it doesn't have to be "imported", remember Islam is a global faith of 1.5/2 bn, there is going to be a few nut jobs that share the same ideology.
Let us not blame Pakistan and have a look at the root problem which may lie right in front us. Most importantly, we all need to have some shame.
Btw, ideas don't need to travel. Shia Sunni animosity has existed since the time of the Prophet saws.