If the outcome is them inconveniencing everyone involved because they haven't really thought about the situation, who cares what the intention is? GP is supporting the argument that drivers should not do unexpected things, and this is a good example of how that rule trumps trying (ineffectually) to be nice. There are lots of situations where someone simply taking their right-of-way or continuing to do what they're doing is much more efficient and safe than suddenly stopping or changing course in the name of courtesy.