This verse is difficult to translate. The New American Standard Bible compares the man who hires fools and strangers to an archer who hits innocent bystanders instead of his target. It is more likely that people will be injured than that the work will get done.
Another way to translate the verse is: a master produces all things, but he who hires a fool, hires those missing the mark. In other words, even a master craftsman, who can produce great things himself, will be disappointed and frustrated if he relies upon a fool for assistance. For a fool can accomplish nothing but destruction, and not even a master can correct that fool’s aim. Here we have another warning not to depend upon wicked and corrupt people for anything.
10 Like an archer who wounds everyone is one who hires a passing fool or drunkard.