Speaking as a German who was attentive in history class, yes, as paradoxical as it sounds, the current government should fight tooth and nail ro remain in control and don't simply relinquish power to the Republicans should Trump win. Although that in itself would be undemocratic, it would also be the last resort to save democracy ironically.
The alternative will be a fascist government that will immediately start to dismantle democracy and persecute the opposition, a.k.a. "the enemy within". I personally would rather not see the superpower with the world's largest military turn into an autocracy.
And that's not even taking into account the effect it would have on climate change, which would become even worse instead of getting at least mitigated. (Democratic societies have no choice but to act as soon as public pressure becomes too high, which it will within the next years. Autocratic societies however can just double down on propaganda and oppression and carry on burning fossil fuels.)