The police of Charlottesville were clearly overmatched for the entirety of the events, it seems a bit optimistic to think they would be able to investigate, make a determination of criminal liability, issue warrants, and extradite persons located in other states in the span of a few days with everything going on.
Wikipedia says Charlottesville is a town of 49k people, I can't imagine they have a large police force on hand to work and investigate cases like this as quickly as they should. Even assuming they have assistance from the VA state police, whatever they're called, its going to take some time to work up an investigation when your targets have fled the state. Search warrants for online accounts and IP addresses to verify the posts, cell phone call logs to verify location, etc etc. Some of that stuff takes more than a few days and you need some real identification to have a judge in a second state sign off on an extradition.
If these assholes aren't arrested by the end of the year, particularly if the FBI doesn't get involved, then I have an issue with them, but this timeline of identifying, putting together a case and arrests/extradition packet within a week by a local small town pd is not realistic.
This is not to say that pressure shouldn't still be applied to the powers that be, of course.
