Actually, it's the aggression of [i]Nazis[/i] in Germany and [i]militarists[/i] in Japan as well as the [i]fascists[/i] in Italy that should be identified as the aggressors in WW2, along with those corporate interests that financed these groups.
"German and Japanese aggressors" is a shorthand that can sometimes be very misleading, not to say harmful, if it is used to justify unfriendly attitudes today.