It's because the British heritage involved committing huge crimes against the indigenous folks that we haven't really acknowledged and haven't dealt with. We can't move on until we do. So we're kinda stuck.
My purely observational understanding is that there are fundamental incompatibilities between aboriginal and 'western/British' culture. "Ownership" of land as probably the primary example. I don't know how that gets 'dealt with'.
Not everything is perfect (far from it), but a lot has been done.
If they get their way (though there's a lot of doubt whether, similar to UK's Reform, this is all just talk and if they ever get into power they'll just feed the rich, like Trump did), they'll sever trade connections with Asia and strengthen ties with the US and EU, because racism.
So there is some connection to trade policy.