To the best of my knowledge, this is the first lawsuit that Tesla has ever filed. Over at TTAC, they are calling Tesla "lawsuit happy". I don't know how many lawsuits it takes to be lawsuit happy, but I'm sure it has to be more than one.
Given that Tesla does not have a history of frivolous lawsuits, I'm going to assume, at least for now, that they have enough evidence that they feel they have a valid case. We just don't know the details, and neither does Pop Mech, so we can't know for sure.
If Tesla does have a valid case, then letting another company steal their technology while billing them for shoddy work is certainly not what Martin had envisioned for the company. That's a whole lot different than "saving the US EV industry". There are still a number of other companies besides Fisker that are working on EVs right now, so I don't see this as having a major negative impact on the entire industry.