Green Day star Billie Joe Armstrong has blasted MTV bosses for letting "manufactured child" Britney Spears open the Video Music Awards. The punk star admits watching the troubled singer stumble through a semi-live performance of new hit Gimme More at the September (07) ceremony was like witnessing "a public execution". He tells Rolling Stone magazine, "People want blood. They want to see other people thrown to the lions. "How could the people at MTV, the people around her, not know this girl was f**ked up? People came in expecting a train wreck, and they got more than they bargained for. "She is a manufactured child. She has come up through this Disney perspective, thinking that all life is about is to be the most ridiculous star you could be. "But it's also about what we look at as entertainment - watching somebody go through that."