in my honest opinion. I will have to say most Hetalia cosplayers are ignorants with no knowledge of what is and what isn't offensive. The anime itself is NOT accurate with the retelling of the brutalities of World War II but its more of a mockery of what really happened. Doing something like this is about as offensive as "cosplaying" Osama Bin Laden and standing in front of the World Trade Center ruins while holding a poster of the WTC collapse. You just don't do that!
Speaking of Ignorants and Hetalia, it bugs me that these kids, because they are silly kids, carry the national flags with no respect and even put them on the floor like most props. I am sorry, but in most national flag etiquette, doing that is a MAJOR offense to the national flags.
Digital Yume Cosplay
Cosplay: My Antidrug