The lyrics neither explicitly nor implicitly indicate whether the green blip was a malfunction or an actual attack. However, the implication of the song is that no matter whether or not an indicated attack is real, the human tendency would be to irrationally rationalize--"Naw, it can't be a real attack!"--therefore rendering the early warning systems completely useless in the event of a real attack.
The lyrics neither explicitly nor implicitly indicate whether the green blip was a malfunction or an actual attack. However, the implication of the song is that no matter whether or not an indicated attack is real, the human tendency would be to irrationally rationalize--"Naw, it can't be a real attack!"--therefore rendering the early warning systems completely useless in the event of a real attack.