The symbolism in Kings and Queens?

In the song Kings and Queens by 30 seconds to mars. I get that the song is about faith and struggles and stuff, I get the song. I don't get the video. Bikers? Are they rebels in a way? Cause when the car hit a biker, that must represent society right? Nobody helped him up because he had to get it on his own? Idk. OH the horse? haha what?! I came up with its a reminder of hope and faith, you know white horse in a dark alley. Anyways, anybody get all of the symbolism in this video, I'm totally lost and its killing me. thanks.