Tony Blair told that British participation in the invasion of Iraq could be illegal

From The Guardian "Tony Blair was told by the government's most senior law officer in a confidential minute less than two weeks before the war that British participation in the American-led invasion of Iraq could be declared illegal.
Lord Goldsmith, the attorney general, spelt out to Mr Blair the dangers of Britain going to war without a second resolution. It is understood that he then went on to warn that British soldiers could be hauled before the International Criminal Court."
Why am I not surprised by this? Invading another country is always wrong, especially when done under the guise of lies. Today we sent a co-worker off to Baghdad (a military surgeon), and what he will see and do in the next year, and his attempts to alleviate suffering that we caused with this invasion will surely try his soul. War is costly, and not necessary.