It's actually pretty insane to force a site to serve content. I think both parties are in the wrong here - HiQ for assuming they're entitled to receive a response from LinkedIn's webservers, and LinkedIn for abusing the CFAA to try to deny service rather than figure out a technical solution to their business problem.
In my view:
* The data is public, and free of copyright. If you're a scraper and can get it, you haven't done anything wrong.
* The servers serving the data are still under LinkedIn's control, and they have no obligation or public duty to always serve that content. They could just as well block you based on your IP or other characteristics. If they want to discriminate and try to only let Google's scrapers access the data - what's wrong with that? Scraper brand is not a protected class. Tough taters if your business model "depends" on your ability to successfully make requests to another uninvolved company's webservers.
If I were the judge, I'd throw this out and let LinkedIn/HiQ duke it out themselves - they deserve each other.