The holocaust doesn't teach us that anti-semitism is an intrinsically European trait, though it does demonstrate the tragic fallout that can result from persistent politically motivated dehumanization.
On the other, I think that excusing the sins of Europe's past by reminding the forum of American historical blemishes is the wrong approach to take.
It is both counterproductive and stupid to associate blame for genocide with generally defined nation-states; the lives of whose constituent people both predate and come well after the guilty acts. If it's ridiculous to imagine the holocaust happening right now in Germany, it's ridiculously to suggest the problem is Germany as a pervasive cultural unit; rather, the problem was the socio-political structure of Germany. This goes for any country's 'attributes'. Generalization of that sort is even less helpful than normal in this circumstance.
Virtually all nations have sordid pasts of one sort of another. Why? Because surprise surprise, virtue is not a trait that can be possessed, gained or lost by nations, because they are invented, and do not HAVE essential traits. Nations contain multiple mixed societies, which individually and collectively determine morals and norms. I am happy to suggest that modern societies are by and large more just than many of those of human history.
Specifically regarding which individual's were guilty during the holocaust.
First of all, obviously some actors and perpetrators were more direct agents than others. Himmler had more agency, and did more to advance the cause than did an individual guard in one of the camps. It is wrong I think, to suggest that defying the German state and refusing to collaborate was an easy task. Helping Jews often meant death, imprisonment, and social ostracization. Even more importantly, the tragedy of the collective action problem also meant that most individuals that contemplated trying to stop the most evil among them from carrying out their goals felt they were helpless individuals against a unified collective; which was obviously not the case.
However, it is also true that society at large, both in Germany and in the territories it conquered, were in part responsible for the success of the holocaust, and in places like Lithuania, local militias were more vigilant about ensuring the death of Jews than even the SS. Many individuals joined the SS eagerly, and just as eagerly committed mass slaughter. The vast majority knew to some extent the terrors that were taking place and either ignored or denied them.
How does one assess guilt in this situation?
I mostly agree with Mr_rb in this regard. The people of Germany during the 1940s shared some collective guilt, as did many Europeans, but they were as much victims of circumstance as were their victims. No group of people is immune to the more horrific aspects of the human personality.
This leads to what I think is the most significant lesson of the holocaust; even the most banal and unremarkable individual has the capacity to be both a despicable villain or an inspiring heroic figure. We all have that capacity. The realization of either identity, it seems, comes from the fateful mix of circumstance and choice that creates all trajectories of life.
Out of the people reading this thread. If, say, we were all born into Hitler's Germany, would you have been a righteous among the nations? A camp operator? Or an average citizen who shielded his eyes when his neighbours were taken off to a 'work camp'? Statistically, you likely would have been in the third category. A sobering thought.
I think the best response is to mull on the tragedy and work out the individual choices involved. Then, try to influence your society into being the best it can be, and always make your own moral choices; even if they come into conflict with group norms. That, methinks, is a more constructive idea than attempting to smear Europeans as antisemites because of the sins of some of their ancestors. :/