well you do. Are you legion? It is curious that someone who purports to support UK sovereignty wants a UK head of state charged with war crimes for honestly carrying out his duties. do you think that when Brexit goes disastrously wrong May should be charged with treason? That would seem to be your line of reasoning.
The key issue is the "sexed up" dossier.
1) Blair demanded that a document was produced that showed Iraq was a direct threat to the UK. There are lots of issues around how he did this. He ended up with the sexed up dossier, which suggested Iraq had chemical weapons and was a threat to Britain (in tiny print the explanation: a theoretical threat to British sovereign bases in Cyprus).
2) Blair showed this to a few chums in government, to the "sofa" that was his unofficial inner cabinet.
3) Blair presented the dossier to the full cabinet. They got the dossier as they walked in and had it taken away as they walked out. They had no time to read it but they had seen it. The sofa told then the synopsis Blair wanted. The cabinet backed this synopsis.
4) Blair went to parliament saying there was evidence that the cabinet had seen but which could not be presented in parliament. Parliament accepted this and backed him.
The attorney general warned of legal problems. Nonetheless Blair got his desired declaration of war, which he had previously promised George Bush he would get.
There are serious issues here about abuse of processes within the UK. There are real doubts about whether this was legal in UK law. There are doubts about whether it was legal in international law. With hindsight the dossier should have been presented to parliament so that 650MPs could read it overnight, discuss it and vote on action. I think there is zero chance that war would have been agreed. Blair used the authority of the PM - authority which he had strengthened - to sidestep this process.
Quite what should happen now is problematic. Putting a former PM on trial is difficult in all sorts of ways. However we have what Clegg while deputy PM called a probable war crime, and it is hard to see how we can resolve this without a trial.
The smoking gun is of course what Norman Baker MP called the strange death of Norman Kelly, the weapons inspector.
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The comparison with May does not work. She has presented information to parliament and now to the nation. She is acting with the authority of the Queen in Parliament (so no possible chance of treason). She is not taking the UK to war.