But the US will not support an international tribunal when it comes to the possibility of indicting US personnel for the fear of it being used as a political tool.
As long as American's are not indicted, then we support it. I suppose we only break rules, not follow them.
The ICTY that is trying Milosevic and Haradinaj has a very narrow and limited jurisdiction--geographically to the boundaries of the former Yugoslavia, in time to the beginning of the recent Balkan Wars 15 years ago, in type of crime to crimes against humanity and further, the ICTY has oversight from the UN Security Council.
The International Criminal Court (ICC) has jurisdiction everywhere over everybody for a long laundry list of crimes, many of which (e.g. "Aggression") are so generally defined as to enable anyone with an ax to grind to grind it there. The ICC is self-regulating--they hear their own appeals, interpret their own law, they have no oversight by any other body, to include the UN.
I suppose we only break rules, not follow them
What rules did we break? Joining the ICC involves signing and ratifying a treaty. We have not done so. Your suggestion that we "break rules" by not following treaties we have not agreed to is without merit.