Fontaines D.C. have a way with mission statements. “I don't belong to anyone/ I don't want to belong to anyone,” frontman Grian Chatten drawls in the chorus of “I Don't Belong,” the opening track of the band's new album A Hero's Death, sounding like someone riddled with angst yet resolved to protect their own freedom at all costs. If not a retreat, it almost sounds like a defensive rebuke of “Big” — Fontaines' last album opener, the