The Western or more so the Developed World's view of terrorism and security is different from the Desi mindset. B'desh toured NZ and were nearly involved in the mosque incident but they were brave enough to continue knowing that this was a lone wolf attack and chances of that happening again immediately are rare.
If the Talib takeover of Afg was the reason, then the tour would have been cancelled and everyone could have saved on flight tickets but if this had to happen a few hours back, there should have been something credible and am sure this is shared with the PCB. Whether it comes out in the open needs to be seen but PCB always seem to have leaks, so wait for a day or 2.
Please stop blaming India for what has happened now without credible info. I doubt BCCI would ask NZ not to tour Pak, their interest lies with Kashmir and as long as that part isnt involved, they don't care. I also highly doubt if Modi (its his bday today) would have influenced the NZ PM to cancel the tour, we Indians don't care much as long as it doesn't involve 'K'.
Could RAW have done something naughty? This would have been porbable if Afg had the earlier India friendly govt, definitely not now with Talib in charge.
Another possibility, considering how close NZ and USA are, and with the displeasure expressed by USA top guns on Pakistan's involvement in toppling the Afg govt, would it be possible that this is vengeance by USA by looping in their close friends to boycott Pakistan.
PS: I am sad that no cricket is taking place, I came in here today to check where this was being streamed.