If the court provided a meaningful alternative I might accept this argument, but given some of the poor track records of expert witnesses, and given that people

If the court provided a meaningful alternative I might accept this argument, but given some of the poor track records of expert witnesses, and given that people will bring in their own personal knowledge regardless of what is said. This is especially true since contesting validity of a source costs money and people don't have infinite money in court. The only conclusion is that the current legal system is so broken that the only reasonable judgment is not guilty.