One very good reason for early diagnosis of Aspergers (or high-functioning ASD) apart from better support with school etc, is that it's possible to start early preparing a child for life in the real world in a way they can work with, using their intelligence and reasoning abilities to improve their self-awareness and help them make beneficial choices. Most children really want to please their close adults and to be liked by their peers, and supportive, loving guidance can help them fit in as best they can, as they will need to do to lead a happy life. But it has to be done in the way they can understand and work with, and until an assessment is made, that's difficult to do.
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