I don't know if Blair did what he thought was right or not, since I don't know Blair well enough to venture a guess.  My suspicion the entire time has been that Blair joined Bush on Iraq in order to preserve the "special relationship" at all costs -- and that he was perhaps betting that a strong alliance with America was important than one with Europe.

That's just my suspicion, but I still struggle to figure why he did it.

Be nice to America. Or we'll bring democracy to your country.