Are you so thoroughly confused? Of course you should be concerned with Perl Harbor. Of course you should be concerned with the Holocause (in't it telling that you removed yourself from that list?).
This is because those were big events and, as such, they teach us complex and lasting lessons. They are manifestations of evil in human nature, so they also serve us as reminders of that evil and help us focus on good in us.
In contrast, the case of USS Liberty, as tragic as it was and as it continues to pain me, was the case of friendly fire. We had almost 10% of such casualties in Viet Nam, in Desert Stornm, and just a few months ago slaughtered (accidentally) a bunch of Canadians in Afghanistan. This is the category of events to which Liberty incident belongs.
Now, why is it that all those cases of friendly fire are crossed out as resolved, except for this one? You've got it: this time friendly fire was committed by the Jooooos. And it was not an accident at all: remember, they also killed another Jew, Joshua -- I mean, Jesus?
Bingo, you uncovered the truth.
But there are unfortunately people who are happy to make charges of anti-Semitism whenever they see an opportunity. They assume that anyone who brings up a subject that they don't wish to see discussed has to be motivated by hatred of Jews. And that was the point I was trying to make in bringing the matter up in the first place. I think the reaction to that original posting of mine proves my point.