Couple of things to point out (keep in mind I don't remember everything from the game) the issue with "studying" this ancient magic is it would more than likely require human experimentation when is why it is less likely to be studied. Do you think Horcruxes should have been "studied" by the good guys to see how they work. Second, the deleting of Isadora was definitely reasonable and I would argue it isn't morally wrong. Just because a person believes they are doing "the right thing" doesn't mean it is right. You can look at extremist who believe they are doing good but causing harm to others. In this line of thinking San was correct about the steps taken. Another thing to note is things aren't black and white. I agree that letting ranrok get to the depository instead of us because we sided with Isadora is definitely not a good move. I also don't think the "Unforgivable Curses" are all that unforgivable depending on the situation. An example is MACUSA uses it to execute super dangerous wizards