I've actually edited this response six or so times so far, but would expect few people to notice and marking it as "edited" would just introduce noise.
Imagine that you have a really competent friend that you trust completely, you relate to them all of the events leading up to the "problem" (or issue or what ever) and tell them to figure out if there was anything else you could have done and get back to you. They say, "I'm on it boss, will let you know." And now you can stop worrying about it and do the next thing on your list.
Now you can argue there is no God and I cannot disprove your argument, but I can relate that this tool or scheme lets me get on with my life, and on more than one occasion I have later received insight (perhaps from my subconscious, I make no claim of origin) on the problem. I find it helpful in my life, and in dealing with things I cannot change but may avoid in the future.