> How can you open a war crime case against a guy who already got a Peace Nobel Prize?

Henry Kissinger (1973 Nobel Peace Prize together with Lê Đức Thọ) can be considered a war criminal:

> https://en.wikipedia.org/wiki/The_Trial_of_Henry_Kissinger

Yasser Arafat (1994 Nobel Peace Prize together with Yitzhak Rabin and Shimon Peres) was also very likely a war criminal.