As for meaning of the song:
Frontman Tim McIlrath spoke about this song: "The song was written inspired of the teen suicides in the month of September 2010, who were bullied for being homosexual. It deals about how people are treated from homophobic bullying and feeling so tormented that they feel there's no place for them in the future and that killing themselves is a better option."
After the song was nominated for the MTV VMAs "Best Video With a Message" Award, McIlrath also revealed that "Make It Stop (September's Children)" was also based on a gay friend of his who committed suicide when he was young.
As for whether it's OK to listen to...
Well, that's much deeper than yes or no. I listened to it, and did just a few minutes research.
Firstly, ask yourself, why do you want to listen to it? OK you may like it, but I notice you have a little Christian symbol up so I'm assuming you have a practising faith. In which case, I ask again, why do you want to listen to a song like this with dubious lyrics?
I always found, when I was challenged by God to sort my music out, that it was better to err on the side of caution. As in, if I had to ask was it OK, then it wasn't, and I got rid.
Don't think it was all that easy, I had to let go of Placebo, Metallica, The Prodigy, Nickleback (ok they weren't so hard lol), Jay-Z, Nirvana etc.
Sometimes a song is more than just bad on the face of it, like the songs where there is a curse word etc. Some songs just give out a bad vibe. This song is bordering on heretical, Although I wouldn't actually say that it is but it could be construed that way, and for all I know it could be meant that way by the writer.
Important also to consider is the band themselves. That quick research I mentioned instantly told me these guys subscribe to Hare Krishna beliefs and some other wacky stuff, despite a 'clean' image. Some other songs have dubious lyrics also.
So, is it OK?
Well, it's "alright". It wont be the end of the world.
Is it Good to listen to it?
No.
And, importantly, is it edifying/will it improve my walk with God or improve my life at all?
No.
HTH.