The flawed intelligence that was presented to Tony Blair was knowingly presented in a way that would make it seem as though going to war is the only possibility.
Incriminating factors for Blair are that the Chilcot report accords him personal responsibility, especially for allegedly ignoring certain important facts in the dossier of 2002.
Blair is not independent from the production of the intelligence that he used as a justification; he authored the foreword of the 2002 dossier which shows his implication. The entire assessment of the 2002 dossier conveys the impression of an intelligence that has severe blind spots for certain facts and that seeks to make a case that allows to go to war.
Even if Blair was presented with false information, it does not justify the breaches of the UK with International Law to conduct an intervention into a sovereign state.