Probably someone else has touched on this, but haven't read all comments .... this poll is questionable:

METHODOLOGY:
The Angus Reid Institute conducted an online survey from July 7-10 among a representative randomized sample of 1521 Canadian adults who are members of the Angus Reid Forum. 
SO an "in house" randomized sample.

Also - the questions:
Which statement comes closest to your own view?

The Trudeau government  did the right thing by settling the case and offering an apology and $10.5 in compensation. (29%)

The Trudeau government did the wrong thing - it should have fought the case and left it to the courts to decide whether Khadr was wrongfully imprisoned. (71%)

Loaded questions and I'm not sure "left it to the courts" was even an option after the 2010 Supreme Court decision that decided exactly that - in Khadr's favour

http://angusreid.org/wp-content/uploads/2017/07/2017.07.11-KhadrFinal.pdf