Good question! I can only address the one about whether a dog that is left to decide for himself might not turn dangerous - in my opinion, the ideal training for working CSV would be to teach it commands and to teach it about different circumstances and ways of dealing with them. Then, the dog will be left to decide not entirely what to do, but which of the learned things to use in a given circumstance. So it depends on what kind of responses you teach the dog, and whether you cover all the possible situations to show the dog which response should be preffered.
An example - friend's male Cane Corso was quite friendly towards people, but then tended to jump on them. So she taught him, that he is supposed to be friendly to people she greets in some way, because they can respond properly and help her get rid of the jumping while still being friendly and enthusiastic, but other people he was supposed to basically ignore. The dog responded not to the command, but to the situation.
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