Well, I have a different take on this.
Regardless of whether I think Bain killed his family (I am 50/50 on that, I favour the murder-suicide scenario - Robin killed his family, David killed his father), I am somewhat disturbed by a number aspects of the dubiousness of the process here.
Firstly, I consider it a gross injustice that a person, having been found not-guilty, has to further prove their innocence. The question of guilt or innocence should rest solely at trial, and once a person has been found not guilty, they're NOT GUILTY... Period!. The facts are that Bain was found not guilty at his retrial. For me, that should mean the guilty verdict in the first trial was automatically wrong, and he should never have been sent to jail in the first place.
Secondly, the Government has clearly gone judge-shopping to get the decision they wanted. I have no doubt that they would not have gone past the first judge if they had got what they wanted first up, just as I am sure they would have kept shopping for new judges if they kept getting told what they didn't want to hear. I liken this to the forensics in the Mark Lundy case where the Police shopped internationally until they found some dubious forensic "gun-for-hire" scientist who was willing to tell them what they wanted to hear.
Thirdly, I disagree with the whole process of making compensation a political decision. The question of compensation should be dealt with as a separate phase in the retrial, in much the same way that a sentencing phase is part of a murder trial. After the accused is found not guilty, the judge retires to consider the question of compensation. Alternatively, it could be dealt with by a panel of five judges of the supreme court, whose decision is final and cannot be appealed by either party. The level of compensation would roughly follow the margin of their decisions.. 5-0 would indicate a large compensation, 4-1 would be less, 3-2 would be even less.