I beg to differ. The examples given involve human agencies, the pleading is that we should ascribe motives to events. Here’s the horse’s mouth, John Leslie himself:
5.31 We must tread carefully here because, I repeat, the availability of a tidy explanation does not mean that other explanations are wrong. The tidiness of an explanation can confirm only that some explanation or other is needed. Competing explanations may be even more tidy. So we might on reflection prefer to believe that our universe, and any others which actually exist, had to be life-containing since God wanted to produce living beings. I am saying only that it would be wrong to reject all explanations in this area, deciding that there was nothing to be explained. - books.google.es/books?id=K71RVWGn0EwC&pg=PA125&lpg=PA125&dq=tidy+explanation&source=bl&ots=76yqceUtvg&sig=OK1yCGZ2buAzFF2hTCKxxyjNZGw&hl=es&sa=X&ei=4QSYT5WKAoOHhQflhNSHBg&ved=0CGUQ6AEwCQ#v=onepage&q=tidy%20explanation&f=false
He doesn’t really seem to be saying much except that maybe the universe is fine-tuned, so maybe there’s a fine-tuner, and maybe the fine-tuner is a powerful personal agent, maybe with a motive, and maybe the motive is to produce living beings such as John Leslie. Few too many maybes.
I draw your attention in particular to his remark:
I am saying only that it would be wrong to reject all explanations in this area, deciding that there was nothing to be explained
So Leslie is saying that it would be wrong to conclude “well there is nothing to be explained.” We don’t automatically jump from this to “therefore God is the explanation,” that requires further reason.
But what Leslie show, is that we cannot just claim as Serious and many pop. level skeptics want to, "well any hand is equally improbable, therefore there is nothing to be explained.
Surely, you would agree that if we were playing 5 card draw and I won with 4 Aces 12 hands in a row that would cry out for explanation?
Or that if we came across an arrow stuck to a barn in the middle of a bullseye that it did not come to be there by chance?
Or that if for his birthday on August 9, 1955, Bob was given a car with the liscense plate BOB 891954, there would be something to be explained?
The issue is not if the event is human or not, but on coming to a specific event, what is the best explanation of it. Now, Leslie says, that we can’t just assume that
a tidy explanation is correct (rightly so), because there might be a better one. But this does show why simply claiming a certain event is just the result of chance is insufficient.
As for applying this to the universe and God, there are fewer maybe’s than you think. You say “maybe” the universe is fine-tuned, but this is widely accepted, so let’s take that maybe away.
Since, this is the result of chance, necessity or design, then we would have to consider the alternatives to design. Chance and necessity strike me as weak, this leaves design.
If a designer, the designer would presumably have to be very powerful, so it is not much of a jump to get to a powerful personal agent.
Since, the fine-tuning brought a series of values into the right range to allow for life, then it seems also probable that the fine-tuner desired to produce intelligent life. So, this doesn’t seem to require too many maybe’s at all.
It only gives you a probable argument, I think, not mathematical proof, but I see no problem with that.