One of our goals is to achieve a meaningful life. To do this means taking ownership to help others find meaning in their lives as well. Criticism is one way to do that. But being critical shouldn’t be used to point out what they are doing wrong, but to explain how they may be harming themselves.
This means establishing real love for them. Your feeling will resonate in their soul. They will recognize your words as sincere and not being offensive. Then they can see your criticism as not disapproving of their faults, but truly aiming to be constructive in your effort to help them. You will be appreciated for that.