No wonder you're having issues, you don't even know what someone has been saying.
So in other words one set of 20 people! And you're throwing your toys out the pram because you think I don't understand.
Honestly i CBA with you any more, obviously you're not going to take my word for it, you're not going to take the word of people who teach these things, nor the thousands of people whose jobs hinge of these very principals, and you're not even going to accept 150+ years of UK case law that puts reasonableness to the test day in day out, so i give up. You obviously know better than everyone, although like i said good luck if you ever find yourself in the courts on something like a negligence charge where you have to prove you did everything a reasonable person would do in order to prevent injury or death.
2 sets of 10 is not the same as 1 set of 20.