That's a great question V and as such it deserves some thought if only on the "should get prosecuted" point alone.
Or perhaps;
Why Parliament was misled.
Why the British people were misled.
Why Ministers of the Crown including the Prime Minister appear to have ignored legal opinion.
Why an unelected Director of Media Communications seems to have been at the heart of these matters of national importance.
Why it seems to have been accepted by a select group within the government that they had the right to adopt a strategy founded on their terms and to suit their overall goals.
Why is seemed so easy to get the national media of this country
‘On message’ so that pertinent questions were not asked as to why this action was really necessary.
Finally, for the moment, why should these people who embarked on this disastrous and unnecessary war
not be called to question and asked to explain their motivation for causing a situation the effects of which have destroyed, and will continue to destroy, many lives and waste money that could have been put to better use for the benefit of those within this nation.
We have been the streetwalkers of the United States for much too long now.