No, it wasn't justified
Around 2,400 American Naval personnel were killed in Pearl Harbor, and around 1,200 were injured. How is it justified, the bombing and killing of over 300,000 people, mainly CIVILIANS, due to petty revenge. Big deal, they killed 2,000 odd people; those people were military personnel. The people the Americans killed were mainly innocent civilians. Worse than the Nazis, at least they targeted potentially threatening points.
It's not a case of "Anti-American bias" it's the simple fact that Americans can't take it when others prove to them that America is not invulnerable, that they can be attacked; and then they get in a strop and kill millions of people.
The Americans are practically at fault for the Al-Qaeda as they supplied them with the weapons the Al-Qaeda are using against them.