"My job is to not get an indictment, my job is to seek the truth and seek justice and do what is right."
There is a strong statement here about motive and justice.
Allowing a Grand Jury to decide for themselves, the DA allowed testimony from those he believed may have been lying, and others that may have been telling the truth; allowing all to testify and the Grand Jury to decide which to believe.
This is a safety technique that keeps opinions of deception from filtering out witnesses. Although it makes the process lengthy, it allows for the Grand Jury to decide, for themselves, about the truth.
Next note his statement and how this is different from the White House: his job was not to get an indictment, but to get to the truth. Rather than allow the rule of law to take its course, the White House will seek federal indictment, instead.
No explanation is given as to why perjury charges are not pursued. This was puzzling, as well, in the Casey Anthony trial, in which the nation watched Cindy Anthony perjure herself, "so help me God", instead of , "so help me", as her own oath changed while she lied.
From NY Daily News: