"They are the only ones left to join the redress scheme of the ARC"
Not meaning to be pedantic LTPF but they are not "the only ones left to join the re-dress scheme" though your point is taken that they haven`t joined as yet . and maybe they wont to their shame .
In my personal view I think it may be better if they don`t as they will come under greater scrutiny .and judgement with all the publicity that goes with it if they have to defend their stand in a court of law as the Govt. minister rightly points out.
And hopefully a far bigger cost to them $$$$ wise.