It's just human nature to find fault with a skipper that runs aground. None of us wants to think that we're one random incident (waterspout, cancer, etc.), away from disaster. If we can point to a fault, we then have proof, at least to ourselves, that we would certainly be exempt from a similar fate.
This brings to mind how the pilots described in The Right Stuff
, by Tom Wolfe would find a way to fault their fellow-pilots who died while testing the latest supersonic jets. These guys were their friends, great pilots who who were testing cutting edge machinery, but by faulting their comrades they were able to convince themselves (and their families) that they had a little more control over their lives than they actually did. The same may be true here when we second guess skipper decisions.