It's about the repercussions of racism. The effect it has on the perpetrator and the victim and also those they come in contact with. We are bound to "crash" into one another because we ignore racism to an extent. When it happens we often turn the other cheek. We're not supposed to talk about it unless it's blatent or violent and we let it slip under the radar because we have to respect others "racial beliefs" Then we get a snowball effect because nobody's saying anything or trying to change something and the problem just gets bigger, thus it comes "crashing" down.