The Dachau massacre, although real, is a poor comparison on moral grounds or otherwise. The best estimates are that only 17 German SS were killed, the massacre was a spontaneous crime of passion carried out with the primary responsibility of junior officers (although I concede Malmedy probably was also to an extent) and reluctantly by those under their command. The massacre was halted --before it became any larger of a blood bath than it was-- by a senior officer threatening to shoot his own men if they continued. But you should know this already as this has been discussed in a thread I started on the subject and don’t really need reminding of it.
I would also state that the motivations of each of the killers is in question are a key distinction. Yes, US soldiers shot a few SS troopers after overrunning a concentration camp filled with the festering dead whereas the Waffen SS simply murdered numbers of US soldiers simply because they were a nuisance. But another question is: what is your point?
I’ve never stated that Americans are any better necessarily than anyone else. And how does the Massacre at Dachau episode in any way legitimize or lesson the actions of the Waffen (German and Romanian) SS actions during the Ardennes Offensive - much of which involved the wanton murder of Belgian civilians. I might also remind you that there are similar instances of Soviet Red Army soldiers who shot concentration camp guards outright and “stories” or their rampages through German towns where anyone found living in a house adorned with Waffen SS regalia --an indication a serving family member-- were almost automatically killed. I might also point out that like the American soldiers who were the ringleaders in the “Vengeance at Dachau” episode, the soldiers serving under Peiper and indeed Peiper himself, all had their death sentences commuted and they were largely exonerated mainly due to procedural errors in the trial and during the investigation conducted (very poorly) by the US Army Counterintelligence Corp and various questionable interrogation tactics they used that amounted to torture. So in the end, they got off. But that doesn’t mean history should exonerate them and the memory of the killed anymore than any other victims of WWII atrocities…