Like the US is carrying out repeated war crimes and the West does nothing - or the "East" for that matter. If something goes to court in the US if it even does, punishment is light [2] and pushed down to the lowest levels (Lynndie England got 2 years [1]). Or pushed by the president (Drone kills without a declaration of war).
If you have nuclear weapons and a large defence budget, you can do whatever you like to other countries.
That only applies to hostilities between the Contracting Parties; most of the drone strikes haven't even been against other countries, but independent militarized groups.
The US and Pakistan are Contracting Parties. Carrying out drone strikes against citizens of one of those parties constitutes hostility against that nation in my book. I'd wager to say that if Pakistan would carry out drone strikes on US soil, the US would count that as an act of war on the side of Pakistan.
That's not a war crime in itself.