I dare say the vast majority of indigenous people in Australia have no problem with Australia Day in the slightest.
The pot-stirring, as always, is caused by a few indigenous activists for reasons of maintaining relevance for themselves and getting more money [isn't that always the case!!], as well as a phalanx of mostly white communists, anarchists, socialists and sundry other misfits who hate our culture and all it stands for. The Watermelon Party is part of this group who, frankly, would be better off living elsewhere.
