Agathiyar tells us to be careful with our thoughts, words, and actions. It shall bring adverse consequences. Similarly, it does so in traveling the path. He tells us to be cautious at all times. Many a Godmen have fallen from grace too. He implies that it is enough that we have brought along a baggage of karma, let us not add on to it.
We are told of the existence of astral and causal karma, in the mental and spiritual spheres, besides earthly karma that has to be dealt with too. The parents take on unknowingly the karma of their children till they reach the age of puberty. Some gurus choose to take on the karma of select disciples.
Paramahansa Yogananda in AUTOBIOGRAPHY OF A YOGI, Self Realization Fellowship, 1990, writes of his guru Sri Yukteswar.
"Even as in his earthly incarnation he had occasionally assumed the weight of disease to lighten his disciple’s karma, so in the astral world his mission as a savior enabled him to take on certain astral karma of dwellers on Hiranyaloka, and thus hasten their evolution into the higher causal world."
Similarly, Tavayogi who stays away from taking on other's karma chose to take on my daughter's. After his samadhi, Dhavanthri came to clear the air when many considered his demise as death as he went through several operations. Dhanvanthri assured us that he went into Samadhi and that was guiding us further in the form of light.
Agathiyar who looks into the stars and the past is known to provide solutions and remedies for one's past deeds, at times backs off and has us go through the ordeal.
Annie Besant and Bhagawan Das in SANATANA DHARMA by the Theosophical Publishing House, 2000 explain the reason.
"Only a full and clear knowledge of the causes in the past resulting in the suffering of the present could justify refusal to help on karmic grounds."
"Whose works are all free from the molding of desire, whose karma is burned up in the fire of wisdom, him the wise have called a sage. Then freedom is achieved, and the man may either remain, as the rishis have remained, to aid in the evolution going on in the Brahmananda or may sink to rest."