First, to correct an earlier post, escape hatches are NOT mandatory for CE certification. My Manta 42 is CE certified and does not have them.
It is not reasonable to look at racing boats to compare safety. Both racing Cats and racing monos are pushing the envelope, both in the way they are designed and built and in the way they are sailed.
Cruising cats truly are harder to capsize than cruising monos, generally speaking, as they have no, or little, keel to trip over. Thus if caught on the beam by a breaking wave, they have a chance of sliding and not capsizing. The Wolfston Unit at Southampton University have demonstrated that there isn't a monohull built that will resist capsize if the wave height is 70% of their length, and it might take a wave only 30% of their length to capsize some. Tests on catamarans show that they may avoid capsize when hit by much larger waves, but a lot depends on the design.
When underway, the biggest danger to a cat is stuffing one of the hulls into a wave when the stern is not directly pointed at the wind. The rapid slowing pushes the apparent wind way up, and the subsequent broach may turn into a pitchpole. Unless you are an expert helmsman with a very well designed cat, you should not run in severe seas. But proper tactics and design, just as in monohulls, make a cruising cat just as safe, and, IMHO, sometimes safer. Insurance statistics for cruisers back this up.
To suggest they are only safe for coastal cruising is nonsense. Prout, of UK, built around 4000 cats before they went bankrupt 8 years ago. These vessels completed a huge number of ocean voyages with an excellent safety record. I don't believe I have ever heard of one capsizing. Prouts were conservative, and not appreciably faster than a monohull, but they were certainly just as safe, and apart from speed, they did have the other advantages of cats; Interior volume, shallow draft for example.
Steve Dashew has made a career out of designing longer, narrower sailboats which only need a modest rig to attain good passage speeds. He's done it again with his motor cruiser. What he doesn't realise is that what he has been working towards all along is a catamaran. We have narrow, easily driven hulls with high hull speed, and on a cruising boat only need a modest rig to maintain good speeds.
You want to watch a Sharkcat playing in the surf off an Australian beach and then say cats aren't as seaworthy!