Personally I don't see a problem with the idea issuing a general pardon for all historic victims of unjust laws. It's symbolic of cultural maturity & progress, an apology to the people for atrocities committed against them & hopefully a stern reminder for the future to never repeat it again.
I'm glad it's been done, but I can find any practical reason why the concept shouldn't be extended to others (it's not like they have to really do anything). It's a token way of the government as an institution to admit fallibility & for society to promote deeper thought on moral issues to ensue we keep our justice system on track.
Read my post. Sceptical side thinks it is money orientated.