They've even decided to pick out faults in each of the other hosts countries regarding security fears:
"India shifted their cricket league to South Africa over security fears.
"We could not tour Bangladesh because there were security fears in March.
"The situation in Sri Lanka was not good either, so from the PCB chairman Ijaz Butt (to) our director general Javed Miandad, everyone has said that ICC must reconsider the decision."
I'm not sure how any of that weighs up next to a direct terrorist attack on cricketers, but okay.
It's also necessary to point out that part of the reason for the IPL's shift to SA was because people were wary about touring the subcontinent following the Lahore attacks. It's a bit rich to use this in your defence.
I understand that last year's Mumbai terror attacks and a general sense of unrest is also to blame for the IPL's shift, not to mention the lack of security for the IPL due to general elections, but the attacks on Sri Lankan players in Pakistan were part of it.
Needless to say, I doubt the ICC is going to reverse their decision. I'm not sure that's what Pakistan even want. What is the goal behind lodging an appeal? That the ICC say "Alright, we'll wait 6 months" and end up cancelling it anyway? It's a bit hazy.