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Portugal and Spain in the 1970s?
There are several other examples of a more or less peaceful transition from autocracy to democracy.
Odds of getting a democratic regime out of a civil war are usually fairly low. The guys with the guns normally do not like to give away their power.
Look at our world right now. How many democracies vs. authoritarian regimes do you count? Then, look at the world at any other point of history outside of the last 100 years.
Democracy is a very unique and rare form of government. I would not gamble on a civil war achieving the outcome you would prefer even if the “good guys” win.
Peaceful mass protests are the only way to stop this authoritarian takeover. If it gets violent the government will always have more firepower.
Trump and his cronies want the protests to become violent. They are hoping for an excuse to throw in jail or kill anyone they do not like. Do not do them that favor.
Also be aware that differences in ground potential can be an issue: https://www.truecable.com/blogs/cable-academy/how-to-fix-a-ground-loop
That is also something you can avoid by going with fibre optics.