Domain names and trademarks are regulated differently. Domain names registrations work on first come first served basis. While trademarks have legal requirements that needs to be fulfilled.

If you have a prior trademark that's the same as the domain name (considering it's unique and not a general word like game, sex or food etc...) and your trademark is somewhat known than you can sue the domain name holder to get it back. This has so many details and requirements so I won't get into that. I don't know the details about the Nissan so can't comment.

As for trademarks and why it doesn't work is you can't sue anyone for using their own name. For example banking network SWIFT can't sue Taylor Swift. Also for a trademark owner to claim infringement the party who is using the said trademarked name/word has to be doing the same or similar work, working in the same industry and/or doing something that's detrimental to the trademark.

I hope I made it more clear for you. Have good day.