Some call it a wake up call; others call it a provocation. Reasonable men and women can disagree about it. There's no doubt that it directly led to the lowest and highest points of Japanese civilization in the 20th century, though.
I think if people looked into the context of events with more curiosity, we would ultimately all benefit from the inquiry.
(And yes, I do believe that America and much of Europe are still pursuing an imperialist agenda. Call me crazy, if you want.)
I would also assume the invasions e.g. of Korea by Japanese before 1853 where not imperialist by intention.
I'm no expert in this area, but I enjoy learning about it.
The attack on Pearl Harbor in 1941 was just a misunderstood act of extending an olive branch?
As for Europe, it's not a country and doesn't move as a unit. Different European countries were pioneers in imperialism, others were latecomers, others were mostly shut out and ended up doing more desperate, brutal invasions in less appealing places.
http://www.latimes.com/world/asia/la-fg-japan-press-freedom-...
Anyway, Abe does nothing more effectively than towing the line for America. In terms of global stability, it's the right play.
As for apologizing, I think it's a stupid issue. Everyone who was involved in Japan's imperialist past is dead now. If every country was required to apologize on a regular schedule for its transgressions, we would never get anything done. Will Obama apologize when he visits Hiroshima this year? I don't expect him to, and I don't care if he does.
I think it's nice that he will visit, and that the leaders of the world will convene near Ise shrine, which is one of the most exceptional treasures that mankind has used its considerable skills to accomplish and preserve.
Everyone involved with Japan's imperialist past may be dead, but some of its victims are not - for example surviving comfort women in Korea. Abe has on many occasions pandered to the extreme right by denying that anything was perpetrated against these people. I can't imagine being a victim of state-sponsored rape and having your experience further denied everytime a prime minister needs to curry favor. But I guess if "stuff needs to get done," that's just the cost of doing business.
http://www.japansubculture.com/how-the-cia-helped-put-the-ya...
Interesting view on history.