I don't usually listen to any hardcore music. I know Rise Against isn't really "hardcore" per se, the post was more about the message of the song than music.
I don't see how Rise Against is really a sell-out. The whole point of their music from the start has been to spread political messages and that's what they've kept doing. If they have to expand their audience into the mainstream to spread their thoughts to more people, more power to them. I'll consider them sell-outs when they make money without making music about anything meaningful like most of the bands teenagers listen to.