just say im sorry

a)from your own point of view is it useful to say "sorry" after years of wrong policies towards a minority? why, what else is neeed?

In my opinion it is not only useful to say im sorry after years of wrong policies towards a minority becasue it has been years of problems and mistreatment. A "Sorry" is not going to make up for what they had to go trought. Even thought nothing will erase the problems the minority had to face, it is better to do it with an act such as infrastructure improvement, or any other help.

b) do you know other cases of indigenous communities that have gone throught the same process? mention them

In my opinion any indigenous community nowadays deal with problems becasue of the policies the government implement, unless they are created to protect them. But I dont know any other specific case.

c) what can different organizations and the private sector do to avoid the abuse of minorities?

different organizations and the private sector can to many things to avoid the abuse of minorities, such as educating them without affecting their culture. also creating secial zones for them to live their lives as they are supposed to.