If you want to nitpick the decision to death, you should take into consideration a 3-engine landing at MLW with a second engine failure inside the marker and with a subsequent need to go-around.
I have no idea what the emergency facilities at the island in question are like, but many islands only have the bare ICAO minimums.
You could probably go on all night.
As I said before, the man on the spot had the info, and made the decision. Live with it.
Good on yer Mike.