One way or another, the world has to come to grips with how it perceives its own history, and unless we have the ability to reflect and understand objectively our own actions (no matter how complicated they might be), then we learn nothing from our past mistakes. As nonsensical as his actions may seem, I think it's at least a step in the right direction. Not to agree that the bombings are justified, but that we need to learn to question the past more deliberately, and not pass it off based on our own personal feelings--and sometimes it takes a radical statement to do that.
Poland is currently following a similar line of thought in regard to its representation in the EU, and while it's a legitimate argument, it could lead to more problems in the future (rather than solving the problems of the present).
That said, there's still merit in the minister's gut for making such a claim, and in his integrity in willingness to resign after it backfired.