so basically, yes if you know what you are doing and know how to train the dog it absolutely is possible to train and trust a dog 100% in any situation
Not "100% in any situation"--there is no possible way that can be true. Assuming everything else you say is true, it sounds like it would be accurate for you to say "nearly 100% of the time in the vast majority of situations." "100% in any situation" is a very hard specification to live up to in any field of endeavor and nothing/no one has managed it yet to my knowledge.
However, letting that stand for the moment, how many people in the U.S. are there who you would say qualify under your definition of "if you know what you are doing and know how to train the dog"?