Presumably people didnt know she was going to JUMP from the damn building maybe?
I mean who posts a picture like that. Generally instagram is used to share happy or cool or pretty experiences in your life with people. It's like she's gloating about her suicide.
I can understand why people like the picture. When my mother died, and I wrote a status about it, a lot of people didn't have the right words to say so they like the post as a sign of condolence acknowledgment of what happened.