“...both protect freedom and avoid a second Civil War...”
Not possible, friend.
They need to be defeated. By any and all means.
You are correct. It would be better if we could preserve the (real, written) Constitution of the United States without 25 million far-left losers as casualties, particularly considering that we would also lose (as a minimum) hundreds of thousands of decent people. However, freedom must be preserved, protected, defended, and passed on to the next generation, regardless of the cost.