This agency stands flat-footed upon the ground, and there it must remain. The world is big enough for us. No ghosts need apply.
It should be obvious to us as rationalists that no miracle actually occurred. The god Krishna did not turn his idol around, nor did some divine force break a hole in the wall. Yet, the idol is turned the other way, and the rear wall does have an opening in it. Someone human must have done these things. Who was it?
It's in pondering these "miracles" that one realises something fairly heartwarming. Society at the time was officially observant of caste rules, which is why Kanakadaasa could not have been allowed entry into the temple, but someone's humaneness ensured that the man got his darshan after all. I'm betting it was one or more of the temple priests. No one else would have had free access to the sanctum sanctorum where the idol was installed, and it is highly unlikely that anyone else would have dared to enter that area to do something so sacrilegious. If caught, their punishment could have been severe.
No, my bet is on one or more kindhearted priests who did what they believed was the right thing. (I think we can rule out bribery, since Kanakadaasa was probably too poor to afford that.) They turned the idol around, made a hole in the wall, perhaps whispered a "Psst!" to Kanakadaasa to come and get his darshan, and then they must have put on the act of their lives to convince everyone around that a major miracle had taken place.
I'd say a miracle took place all right. Human kindness, and the willingness to break rules to ensure justice, never fail to touch me.