Regarding this...
Marie Nilsson: "I just want to negotiate, but how the hell is an American going to understand that?!"
It seems that Marie uses the word "negotiate" without taking into account how the application of the term's definition includes being based upon mutual agreement.
It is probably best to start such a negotiation from common ground. What can Marie (or IF Metal) and representatives of Tesla Sweden both agree upon? It would be interesting to hear from proponents of a collective agreement upon how not starting from a stance of mutual respect is a key aspect of their failure in achieving what they call negotiation.
The very nature of the so-called "dispute" is actually over IF Metal's management being unable to start from the fact that there is no requirement for Tesla to negotiate when IF Metal will neither accept nor acknowledge that "no collective agreement" can be a legitimate outcome supported by law, ethics, and morality. Most would classify this behavior as a form of denial.
Disregarding the voluntary nature of the thing they hold so dear (their ability to exercise power over others) was where they went wrong. They then embarked upon using strong-arm tactics to "negotiate" when they didn't actually have a very strong arm.
After this failed, they now write a small novel of nonsense in an attempt at virtue signalling, while continuing to avoid any attempt to approach Tesla Sweden's management with a reasonable argument for how entering into a collective agreement would benefit Tesla Sweden. Such an approach does not in any way represent a step toward negotiation.
They are euphemistically saying "negotiation" while applying tactics most often reserved to bullies, organized crime, and terrorists. Yet, they keep trying to paint this as if some fact exists which would justify IF Metal's position, when there is no actual grievance being claimed.
It is a stretch to conceive of any moral high ground being defended when IF Metal's argument for forcing companies to enter into a collective agreement is based entirely upon the imagined potential for some future grievance to occur.
Here's a bit of wisdom that might be worthy of their consideration,
"If it ain't broke, don't try to fix it."