I am for being sensitive to the concern of minorities, but this seems going too far.  Obviously his stance on treatment of aboriginals was wrong, but lets remember in 1867 where racism was the norm unlike 2017.  If he held those same views today then he would be viewed in a different light, but you have to look at the timeframe.  This was the guy who was the first prime-minister of the greatest country of earth so why would we not want to honour him for that.