ID cards do not prevent or hinder terrorism. It is often claimed that identity cards will prevent, or reduce the likelihood of, ideologically inspired acts of violence such as those perpetuated on 11th September 2001 using aircraft in America, or the discotheque explosions on 12th October 2002 in Bali, or the commuter train bombs on 11th March 2004 in Madrid. These claims are not supported by either the reason or the evidence. If anything, enforced ID will make such events more likely.
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http://www.idfolly.org.uk/articles/IdeologicalViolence.htm