How can the move be immature if it foils your calculation! You're half right and I have nearly fallen into the same trap. I believe you're talking about conditional moves? The trap is too, not give the same amount of calculation to each move in the sequence. Best advice is too use conditional moves only when there are very limited forced moves that way you can calculate all possible moves without missing any simple immature moves!
Advance Moves
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There is always the possibilty that you're opponent will play the right move for the wrong reason! Or how you put it ... an immature simple move that costs you the game!
On many occasions, where I am winning, I made one or two or even three countermoves in advance, only to be fooled by an immature simple move not anticipated, which cost me the game. Do not enter moves in advance, rather wait...