'Many people' would include me, and should include everybody else to be honest.
Historical revisionism is dangerous because if you don't learn the truth you can't avoid making the same mistakes. Because the Japanese weren't punished for their horrible crimes, a lot of Japanese people deny they ever happened (including many government officials.) A few believe it did happen, but they don't see anything wrong with it. And, really, Japan is the single most racist, xenophobic, nationalistic first world country by leaps and bounds.
Culturally, Japan isn't much different now than they were before WW2. On the other hand, Germany was slapped down for what they did.
What would happen if a German man put up a "no Jews" sign in his shop window? Jail.
What would happen if a Japanese man put up a "no Chinese" sign in his shop window? This happens all the time.
Now that you've been told what happened, and what is still happening because FDR's cronies were greedy douches, there are some lessons you (at least) should learn from this: Don't let Japan remilitarize - they aren't our allies, never were and never will be; and, for christ's sake, stop electing politicians with corporate interests.