I have also lost a dog to bloat.
They say that one of the risk factors is having a relative that bloated. In my case, my dog's full brother had bloated and was saved a few years before my dog bloated and torsed and couldn't be saved.
The half sister of these two also had a minor bloat episode that I caught very early, and she was tubed. One of her puppies has been lost to bloat, another suffered a bloat but was saved. And one of her half sister's puppies was also lost to bloat.
I think it's extremely reasonable to consider that it's genetic when you look at the above scenario. OTOH, it's a deep chested breed that is prone so is it the simple risk of being that breed or is it genetic? Who knows?
One should definitely read all they can on it and BE PREPARED. Your own vet may not be able to deal with a torsion case and you may get sent on to another emergency or after hours clinic. KNOW where these are, and know how to get there.
Do not think you are safe by feeding a raw diet. I have occasionally read of dogs that bloated on the raw diet. As far as I'm concerned, no one is safe. Don't ever be complacent about something so deadly.
You can follow all the guidelines that float around out there and still experience it. The dog I lost ate his breakfast and went back to bed and bloated. He wasn't doing anything. He wasn't exercising. He didn't drink too much. He wasn't anxious or nervous. He absolutely didn't fall into most of the risk factors other than being a Doberman and having a relative that bloated.