There is a similar situation in Australia, with the indigineous people asking for an apology, and the conservatives, who were just voted out, saying exactly the same arguments against an apology.
There are some points to consider.
1) Before we turned up, they had a functioning society that had existed for thousands of years. I'm not saying I would have liked to live that life, but for something to last that long, it must have had a good measure of functionality or it would have self destructed. Once we took over, their society has become, in many areas, highly dysfunctional.
2) We are doing very well out of Australia, and they aren't.
3) There is a lot of resentment about their current position in society.
I'm quite happy to say 'sorry', not because I directly cause the problems they are experiencing, but because I can see quite clearly that even today, I am causing problems indirectly. We have pretty well all their land, and the wealth. It was only in the 1960's that we even acknowledged they were citizens in their own land, and even more recently that the doctrine of 'terra nullus' was overturned. That is, we recognised they even lived in this country before we got here.
They had no drug problems before we got here, nor many of the diseases. It was not an idyllic life, but it worked better then, for them, than it does now.