Ah, I see - I thought it was something observed on the anniversary of a loved one's death. A generalized survivor day for everyone seems troubling for different reasons. As you say, we don't have a day for people whose loved ones die of cancer or auto accidents. It would be kind of like saying, "those poor suckers, I'm glad it wasn't me..."
I'd almost be a little more open to it if the day was about suicide prevention - reaching out to people who are hurting, making it clear you've available to listen or help someone in need. But a concentrated effort of everyone doing that on just one day is wrong, too. Really these are the sorts of efforts (and resources) that should be in place across a whole community, and not just one day a year.