Gufi, no one has ever been dragged back. At one time, in young age, I also used to think like you but time has proven that it was nothing but an illusion. These criminals are untouchable not because they are very powerful but because those who claim to try them are as much corrupt as are these. You will see nothing will happen, merey moonh mein khaak, but I know nothing will happen. The same or their offspring will continue to rule Pakistan for eons to come.
Their trips to abroad are regular and normal happenings. I do not see anything unusual about it. Their assets, business, investments, just about everything is abroad. There is nothing unusual about these travels.