How would you know? 13 million were killed!
If you don't even know how many were killed or why, how can you possibly know if it was or wasn't justified? Kind of like getting huffy about the slaughter of polar bears in the Antarctic!
Although I'm sure you were taught, in good faith, that 13 million Jews died in the holocaust, the official number has been continually dwindling over the years.
The last I read an Israeli scholar on the subject, he seemed quite certain it was actually somewhere under 4 million.
I believe the "official scholarly number" is under 4 million, while the "official popularized number" is around 6ish.
But that "official popularized number" certainly used to be much higher.
I think it was 20 million at one time.
Also, as these numbers keep changing, I wouldn't be surprised if they go up or down some more, and I have to apologize for giving a wrong number.
I'm not picking on the Jews, or you, or anyone else.
I'm just saying this number has continually decreased.