You need to wake up from your Yankee dreamworld.
Washington was a slaveowner and a Southerner, and a VIRGINIAN. He would have never made war on his own people.
Washington was a nationalist. All Americans were his countrymen. He recognized that the nation must be united to survive and prosper. Unlike many later Southerners, Washington's vision extended beyond the slave shack and plantation boundary.
"For this you have every inducement of sympathy and interest. Citizens, by birth or choice, of a common country, that country has a right to concentrate your affections. The name of American, which belongs to you in your national capacity, must always exalt the just pride of patriotism more than any appellation derived from local discriminations." -- George Washington, 1796
Lincoln didn't make war on his own people, Davis did. Washington wouldn't have supported his rebellion, especially one over slavery.
Apparently YOU are also unfamiliar with Washington's Farewell Address or the character of the man. He would have shot down the traitors as quickly as Andrew Jackson, another slave owner but also a Patriot.
Washington considered himself an American above all as even a slight knowledge of his biography makes obvious.
President Jackson's exact words were: "If one drop of blood be shed in defiance of the laws of the United States, I will hang the first man of them I can get my hands on to the first treee I can find."