Hetalia is NOT, I repeat, NOT, the complete record of history.
It is NOT supposed to be taken at face value.
Those characters stand for much more complicated situations.
Don't act so disgusted with people who enjoy it for the particular WAY it depicts history - that's like hating a history book from a different country. They cover different things, place emphasis on different pieces.
Of COURSE it's not going to go deep into the intricacies of the atrocities committed during the world wars! It's a comic satire, that is meant to poke fun at the goofy side of international relations, it is not meant to be a reliable secondary source! Don't get something? Feel like it's too general? WWW DOT LOOK IT THE HELL UP DOT COM.
Hidekaz's intent with this comic was to make history enjoyable and accessible to people. It's a mnemonic, if you will.
What some of those nations did (my own included) was disgusting. It was inhuman, ignorant, and utterly wrong, and no one should disregard this aspect of history. But neither should we take refuge in our offendedness, puffing ourselves up in fear that we may appear thoughtless, or that we may forget.
We'll never forget. It's okay to simplify. History is ALWAYS simplified, no matter how specific.
We will never know precisely what the guards in Japanese internment camps in California were thinking. We will never know who exactly was in which trench - it's too much information for anyone to process.
What we can do is draw people in with silly comics, and curious anecdotes, and say "Hey, look here! Look at what we did!" and then, hopefully, some portion of those people will go on to look deeper, and accept and try to comprehend the not-so-nice parts.
If you read all of this, thank you, and I truly hope I haven't offended anyone. Please feel free to add your own thoughts on the matter.
P.S. And DON'T, please for the love of all that is beautiful in this world, judge it by the people who love it for the animu ghey bishie factor. Sweet Christ, no. Ignore them. They do not exist in the real world. They are figments of the internet.
Listening to: Honk! The Musical
Reading: Interesting Times - Pratchett, Othello
Drinking: so much tea nnnghhh I'm so sick