So because your boat is only a "day boat", that means it won't sink or catch fire or run aground a reef? And how many divers does it carry ? I think if it carries 15 or more, yeah, I am NOT GETTING ON YOUR BOAT WITHOUT A LIFE RAFT!!! We have plenty of boats in the US that are only "day boats", but they carry life rafts. A reef can sink a day boat just as well as a liveaboard, just as a wave can turn one over, and fire doesn't care either!
And as far as your food poisoning analogy, it depends on the type of food poisoning. In many kinds, it is entirely appropriate to hold the restaurant owner entirely at fault, and never the food supplier at all. If the restaurant owner buys meat and stores it improperly, and people get food poisoning, it is the owner's fault-not the person who sold him the meat. If you have a stable boat, and modify it by adding decks that make it top heavy, it is NOT the fault of the boat designer-it's the fault of the person adding the extra decks. You really don't understand logical reasoning AT ALL!!
And if you designed ultrasound machines with the same illogical thinking you've demonstrated here, well, I hope I never have to use one of those machines!!!
Many will say "I don't need you on my boat" as a reply to your comment. In fact, I really wish that you come one day. I am sure that you will change your mindset drastically. Don't let fear control your life. We all live once. Make it count. You can stay from water as much as you want. Then a meatball stuck in your throat for more than a minute! Will you stop eating meatballs?!
As I mentioned, We have our own speed boat. In case of emergency, that speed boat will be a much better than a life raft, and faster too. Also, if Splash caught fire, or hit a reef barrier, or whatever disaster could happen, guess what, as a daily boat, we will be surrounded by at least 3 more boats (unlike liveaboard). Not to mention that we usually are much closer to shore than liveaboard.
Regarding modifying boats, designs are submitted for approval before execution. Same like building a gazebo at your backyard, you need to get the proper approvals from your zooning department. Owners they don't just modify boats as they wish!
Back to the food poisoning analogy, supplier is the last to blame. How about the chef and kitchen staff themselves?!
As for the Ultrasound machines, you AND all your loved ones already have used them many times. That I can tell you for sure. I can even name them for you.
GE Voluson, when you were expecting your babe to join us on earth.
GE Logiq, when you had this bad abdominal pain once.
GE Vivid, when you needed to make sure that your heart is working properly.
I hope that you have never needed to use the more sophisticated ones for more serious stuff. God bless you!
And yes, you can thank me for my services later.