Really? One screw holds the boom to the mast?

[BrianKay]

I'm still a relatively new Ariel owner, so forgive any naivete in what follows.

Yesterday, when preparing to sail and tightening my boomvang, the boom itself broke loose from the mast and hit the deck. Upon closer inspection, it seems a single screw had fatigued until the point of failure. I replaced it on the spot (see photo), but am now wondering -- does so much really depend this one screw? Am I safe to sail again? It seem the one little screw would experience a lot of pressure and torque as the sole part that connects the boom to the mast.

Thanks for any thoughts!