Tesla is a good opponent. Musk is generally despised. Electric vehicles are seen as fancy-pants toys for eco-freaks. So the usual people who come to the defense of big companies don't really feel the need to break a lance for Tesla.

This is specifically the case with the Sweden Democrats. A big motivator for them is a) bashing greens, and b) being a better alternative for the working class than the Social Democrats. Siding with a foreign billionaire over "salt-of-the-earth" workers is not a winning move.