Why not blame both? Why should they be trying to find out who's who. If you found out someone was Turkish, would you immediately ask them if they supported Erdogan? If someone was Hungarian, would you try to find out if they supported Orban?
I don't know if you're an American, but how would you like it if, every time you met a non-American, you would have to announce that you don't support Trump because they're trying to "find out who's who?"