But jumping on a disaster to make money is always bad. There's a reason being a war profiteer was a prosecutable offense (though that seems to have gone out the window in recent decades.)
I'm not sure what your question is; do you mean is there anything Facebook could do when there's a disaster that wouldn't seem like they're trying to cash grab in a very inappropriate way? I don't know. My response would be Facebook is not important when there's a disaster, there's plenty of other forms of communication. If you can use Facebook then you have internet and phone/texting access, so you don't need Facebook. Your loved ones can get a hold of you by more direct methods.
Which is not to say it's impossible Facebook could come up with a useful feature that would be helpful to people during a disaster; but "Safety Check" is not that.