and the other side of the coin....
In some cases, the Captain has decided that it is safe to go, whereas the First Officer, having looked at the radar (while in the hold position, or close thereby) and definately does not like what he sees....what is he to do?
The wise Captain would have a think (what if he is right, even if he has never been before...or, he's to young to know...or, so what, my minds made up, going anyway, etc).
Hard to explain those big dents in the leading edge you received from hail to the Chief Pilot....and having the F/O saying..."told you so."
Perhaps a slightly longer think may be required.