Do you blame only one person for the popularization of national socialism in Germany (nazism)? Because one person couldn't pull it off. A large group of people did this. The fact that one person from this group was born in Austria, but lived in Germany since his early 20's, changes nothing.
It's like saying that Stalin (who also wasn't Russian) was the only person responsible for the horrors of communism, but in reality, there were lots of like-minded people near him.
