Oh, now I get it! It's what we in the English-speaking community refer to as a 'non sequitur'. 
'Canada is' was right. Irrelevant. Your statement is an invalid argument. The good that some staff did was clearly not mitigated by the bad of the residential schools.

What Beyak did, incidentally, was to apply BS 'moral relativism'. It was a clumsy attempt to justify the unjustifiable Indian residential schools by minimizing the suffering of victims. It's a very common and transparent ploy of racists.