Well, for those who feel offended about my comments, I would like to let you know that I feel regret and shame for having posted that comment.
As for watching the film, the discretion of watching it is left to the individual. I read once that many veterans of World War II were incapable of watching war films because it would bring up those memories and feelings to the surface.
Are we really comparing the rinky-dink fourth rate terrorist bombing of the Boston Marathon to World War II? If so, then I suppose Iraq, Afghanistan, Syria, and many other countries are experiencing a new world war every week.
People are being too sensitive about this. And honestly, unless you were directly involved, there's no earthly reason for being offended by an act of terrorism in the 23rd century universe of Abrams' Star Trek.