In this age, it is difficult to avoid giving offense in some fashion or another (people being so eager to search it out), so coming up with “art that does not offend anyone” is probably an impossible task, short of abstract designs (perhaps classical Islamic art had something there).
But is it okay to censor stuff just because it’s frickin’ ugly? Or for someone to make an aesthetic judgment not to publically fund an art project, or, at the very least, to decide that a rather unsightly “reaction … to 9/11” is probably not an proper subject for public art at an international airport?
Frankly, I don’t think that’s censorship. That’s just good sense.