supervision

Hello,
The Rabbi always says that when someone dies, etc., one should not ask why God caused it, etc., now someone sent me a passage from the book Two Carts and a Hot Air Balloon in which the Rabbi explains in good taste why it is correct to use two lines of explanation and explain why everything happened even if it is explained according to the laws of nature.
Basically, my question is why it is impossible to say that every event that happens because of the laws of nature (not miracles) is precisely according to heavenly calculations.