When I heard abut this the first time I also was surprised that this stuff is not available for free. In a country governed by laws it should be one of the most important things that the law is easily accessible to all people.
As rayiner points out [1], court filings are not case law. Decisions, the only component of a court's output that can properly be considered law, are generally freely and publicly available.
And I would tend to agree with you. But make that argument, not something about the laws of the land being locked away. The “free law” pitch comes across as dishonest to anyone remotely familiar with the system.