Fin Keels have nothing to do with seaworthiness; they're about speed/production costs = profits. Do a "loses keel" on Google. Check out the images too.
The single keel on my 36 footer has over 4.6 million pounds of tensile strength in the steel supporting them. Not much chance of that breaking. Keel loses are on high aspect ratio , minimum design racing boats , not on longish fin keels, common on cruising boats.