We might tend to avoid focusing on the pain/ emotional conflicts of our ancestors. We fail to acknowledge the ancestor who is in pain, even though we unknowingly identify with the pain and are not able to let go of it.
The actual reason behind issues in life remain unknown and the future generations end up being doomed as they are stuck with that ancestral defect. The person who is really suffering in the family should release it because he/she has unconsciously taken the mantle. And these do not resolve completely, even with rituals. Even though rituals are good, they are more of a formal process than an emotional process. Hence, one might not really release the grief so as to be at peace with the departed person.
The importance of someone who knows the Healing Technique is, hence, indispensable. And Karma Gurus teach exactly that.