Ian Watkins, the lead singer, is now in prison for sexual abuse of children. We're not talking the typical groomer here, he actually raped kids as young as toddlers. He's a monster. A lot of their songs are absolute bangers, but knowing about him makes it hard to listen to them.
The rest of the band (to my knowledge) are decent, though. They broke up the band upon learning the truth about Watkins, and has since formed a new band.