Look, it is this simple - the Intelligence was not just sexed-up, it was concocted - further, the legal advice was not just sexed-up, it was also concocted - so, "the supreme international war crime" (according to the Geneva Conventions) of waging aggressive war on a sovereign state, was indeed committed by Blair, Goldsmith, Straw, Hoon, Falconer, Morgan and others.
The British war criminals knew that Iraq posed no threat to the United Kingdom, and that a pre-emptive invasion of Iraq could not be claimed to be necessary in self-defence, which was why there was a need for the Intelligence to be sexed-up, nay concocted. Furthermore, because the British war criminals knew that they could not obtain the further United Nations resolution required (if they were not acting in self-defence, as they knew they were not), it was necessary to sex-up/concoct the legal advice. Further, the then Chief of the British Armed Forces, Sir Michael Boyce, asked on 13 March 2003 for assurances from the Government that the proposed invasion was legal and that his forces would not be committing a war crime by invading Iraq. That was why the Goldsmith 7 March 2003 written legal advice (which itself represented Goldsmith's first change of mind), with all its caveats, had to be so drastically changed (with a little help from Lord Falconer and Baroness Morgan who had an unminuted meeting with Goldsmith at 10 Downing Street on 14 March 2003, at which the latter conveyed his "verbal view") to the infamous 17 March 2003 Parliamentary Answer on a single sheet of A4, devoid of all previous caveats, purporting as it did at the time to be the definitive legal advice, when it was no such thing. In any case, it was not for Goldsmith to decide whether Iraq had or had not complied with a combination of previous United Nations resolutions - that was always something for the United Nations to decide. The "legal advice" on the single sheet of A4 (which we are not even sure was written by Goldsmith) was what was shown to Sir Michael Boyce and the Cabinet. Robin Cook (former Foreign Secretary) resigned on 17 March 2003, and the second most senior lawyer at the Foreign Office, Elizabeth Wilmshurst, resigned the following day. Those two, Robin Cook and Elizabeth Wilmshurst, were alone in resigning - the rest, who could have made a difference, just sat on their hands.