Correct most of the time. But not always. And that is the problem.
Look at how many children get attacked by dogs that have always been loving and friendly.
How often are they labs and Jack Russells though compared to other breeds?
Obviously some dogs will do more damage and some dogs will just be wrong uns but a lot is still down to up bringing.
Have big dogs myself and would never leave them alone with children because there is always that 1% there of what if. Also have little dogs and wouldn't leave them alone with other people's kids, but they can be with mine now she is older.
Never understood leaving their dogs with a baby, or with a small child who's eating.
Dogs eating their owner is very strange though, have heard of it in the past when the owner has passed out or died and it's happened.