In 1970 it was no more appropriate to sexual abuse people, beat them senseless, kill them, electrocute them, etc. than it is now. These are the things the victims claim to have suffered.
But an apology from the Pope wouldn’t be for those wrongs. Those apologies have to come from the perpetrators, or their immediate supervisors who knew of the wrongs being committed.
This is why I asked all of those questions.
What is the Pope apologizing for, or being asked to apologize for, on behalf of the Church?
The fact that the Residential Schools existed and that such atrocities were committed in them.
What is the Church alleged to have done or failed to do to cause this harm?
First, allowing organizations under its umbrella to create and operate the schools and removing Native children from their communities to live in the schools. Second, failing to exercise oversight over the organizations operating the schools to ensure that children were safe.
Is this something they could have known or reasonably been expected to know they should do?
NO. The standards of the day were very different than it is today. Boarding schools were commonplace and the upper-class individuals dictating education policy all would have been educated in a boarding school environment (and often subject to abuse in that environment). They did not understand the importance of cultural connections or the harm that came from severing them (see, for instance, the ill-fated Sixties Scoop). And large institutions like the Catholic Church were struggling to understand how to exercise control on an emerging international stage and were operating with what they believed to be the best structures of the day (based very much on the principles of subsidiarity).
We have improved our understand in many of these areas, but in the 1930s, or 1960s, the actions of the church were not below the reasonable standard of care.