The other side of the coin, of course, is that suppressing FOI is often a convenient way for government to bury unpalatable (as opposed to sensitive) information. Let's not kid ourselves terrorists do not have sufficiently detailed technical knowledge to select those targets that are likely to cause maximum damage and disruption. In that respect, it's better to leave them in no doubt we know how they're thinking. Of course, I would never advocate disclosing substantive intelligence, but that's a different matter altogether and there are sufficient safeguards in FOI legislation to prevent such disclosure.