Dunno whatcha mean by background, Mr. Twilight of the Gods.
I'm sure that many Germans thought they were right. It's not like Goebbels was splashing photos of gassed Jews all over the front page of the FAZ, and Hitler was a rather convincing figure. After Versailles, restoring the honor of the Fatherland was pretty important to prideful nationalists, etc., etc., etc.
But in hindsight, the German cause was not honorable. Sorry. We can talk all we want about how the Waffen SS were disciplined, well-armed, tough, loyal, and fearless, but that doesn't make them model citizens. If all you expect of a soldier is raw warfighting ability, then great. But I'm not going to praise the SS without major qualifications.