They're not posts "about aboriginal people". They're posts about Australia day.
It should be a day to celebrate indigenous people and indigenous history, from Tullamareena for burning down Melbourne jail, to A. M. Fernando for protesting covered in skeletons outside of Buckingham Palace.
I think Australia Day is used to celebrate the wrong things, and I'll downvote posts I think do that. That's my business and you're not the fucking moral police of me cunt face.