Far from me to stand up for the Tony Blair administration, but in my opinion regarding ISIS, headlines like below are both unfair and misleading.
Tony Blair concedes link between Islamic State and Iraq War
www.bbc.co.uk/news/uk-politics-34630380
”Tony Blair has apologised for mistakes made over the Iraq War - and said there were "elements of truth" to claims the war caused the rise of Islamic State.”
”The ex-PM said "those of us who removed Saddam" did bear some responsibility for the situation in Iraq today.”
”But he again defended the invasion, saying it was "hard to apologise" for removing Saddam Hussein and that Iraq might have become like Syria otherwise.”
Iraq’s Saddam Hussein was a Sunni religiously representing around 40% of Iraq and it would have been members of his more anti west/anti new Iraqi Shia regime, the radical Tikrit tribe and Sunni administration/generals - that would have needed to be imprisoned by the western coalition – but as mentioned below, those in the likes of Abu Ghraib were badly mistreated.
”Abu Ghraib torture and prisoner abuse”
en.wikipedia.org/wiki/Abu_Ghraib_torture_and_prisoner_abuse
During the war in Iraq that began in March 2003, personnel of the United States Army and the Central Intelligence Agency committed a series of human rights violations against detainees in the Abu Ghraib prison in Iraq.These violations included physical and sexual abuse, torture, rape, sodomy, and murder. The abuses came to light with reports published in late 2003 by Amnesty International and the Associated Press. The incidents received widespread condemnation both within the United States and abroad, although the soldiers received support from some conservative media within the United States.
But once that ‘Human Rights’ stuff hit the fan, the prisoners life changed dramatically; think of the UK’s best Open Prison and then some, albeit with no rights to leave on a day trip.
So what the Sunni radicals in these new prisons had, from around 2004 onwards, was a place to plan ahead amongst themselves, with literally a large captive audience to convert/recruit – hence when released they were in terms of organisation and military expertise, able to hit the ground running while securing military ‘seed money’ finance – from other Sunni States worried about Sunnis under an oppressive President Assad in Syria, and non inclusive new Shia Iraqi administration under Prime Minister Al Maliki, since asked to step down.
The Islamist extremists ISIS have become was unlikely to have been in the early new Caliphate ‘business plan’ when securing seed money, but the ability to ‘shock and awe’ would have been. But having morphed, ISIS become an embarrassment to the Muslim faith and the vast majority of Muslims worldwide. IMO.
In Conclusion; So while Mr Blair is responsible (with Bush) for starting some Iraqi ‘crusade’, there were enough Americans and moderate Iraqis on the ground post Abu Ghraib warning of what they were seeing e.g. the beginning of an organised group, that at that time where NOT listened to, for Blair to be blamed for DIRECTLY forming ISIS, again IMO.