I expect the heavy coverage here in America but I'm a bit surprised it's inundating Europe. Personally I don't care for the coverage each year, mostly because it was so horrific that I won't ever forget it and don't want to relive it. Being the 10 year anniversary they are really pumping it this year. It started 2 weeks ago if you can believe it. Not to be unpatriotic but this stuff is just too depressing to dwell on for so many days at a time.
Since it was a news story there is tons of free footage that these channels can cobble together to make shows, so I doubt it's being done out of sympathy but rather as a means to generate profits. As for airing this stuff in Europe though, well, I don't know what their motivation is. Sure it's noteworthy but does a person in say Holland *cough cough* really want to watch wall to wall coverage of 9/11 ?