Selfishly wanting Selflessness: Please Close Door Quietly

In the flat I live in one of my neighbours placed this on the main door, It appeared shortly after the couple downstair moved in.

 

Although technically this is a selfish plea, I can see my neighbour, who lives on the ground floors point, and why should she and the neighbour opposite her have to hear the door slam because downstairs don't care about any one else?

Done