According to documents Peiper was not even there when the incident occurred nor has there been evidence that he ordered the men in his command to kill them. Unless, you point to what he said he was told about the handling of POWs. I don't have the direct quote, but can locate it for you if you want. The qoute can be understood different ways. You said Peiper had more of a chance. Do you mean becasue he lived longer? He had a weapon? What happened to the American soliders was horrible and it shouldn't have occurred, but it did. When Peiper was killed, it was not in a war. The war ended decades prior. Whoever did it had no business doing what they did. I understand about being angry at someone, but they crossed the line in my opinion.
Unfotunately, life isn't as fair as it should be. I wish it was, but it isn't. If a US solider does something wrong, beyond the rules of engagement etc, he or she deserves to get punished. Just like anyone else. But not by mere civilians. It should be handled by, as in here, the military tribunal. There is a reason why there is a military tribunal, why laws are in place. Since, you were in the military you probably know this. Peiper was handled by a military tribunal. The trial wasn't fair and we can see where that lead too. We cannot alter or dispose of what the United States has deemed to give people, even its enemies; military or civilian. The United States decided to give everyone a fair trial and that's how it should be.