It's public access, Khosla doesn't get to decide if it's trespassing. That would be a complaint lodged by the local authorities against someone if they were accessing the land in prohibited hours.

So it would be murder. Who knows, maybe Khosla wants to hunt humans for the sport of it but probably he just wants to keep paying miniscule fines hoping to wear the public down.

I'd lodge the fines in the form of the land he owns abutting the easement.

Wrong state.

The state of California has the common sense to not allow you to execute someone just because you believe they may be trespassing.