Don if you are throwing spaghetti at the wall to see what sticks, okay - but I hope you're not serious about your list of U.S. villainies. Almost every issue you posed is moot. I could argue the historically correct analysis of each itew and mitigate most fears of evil and villany. I am compelled to answer disinformation when I see it, but going over each item is too time intensive for me at the present.
I can point out a few mitigations...
3/5 compromise of the Constitution and the Dred Scott decision: The Dred Scott decision during Buchanan's administration was not just a state's rights question against federal intrusion, but whether one state's statutes could override another state's. That it denied Scott his freedom rallied the Republicans to preeminence, and Lincoln's rise to the Presidency. The 3/5 compromise was not a pro-Slavery edict - but an anti-Slavery one. It was done to deny Slave owners from conflatingtheir votes with their slaves. If you argue slavery is evil, then both of these things added to goodness and virtue.
Red Scares of A. Mitchell Palmer in the 1920's and Joseph McCarthy in the 1950's: Revisionism. McCarthy was the wrong personality to win popular acclaim for his actions, but since Peristroika and Glasnost opened the KGB files we have inarguable documentation now that the Communists he was after were foreign agents emplaced to destroy our government. Much of the appearance of evil was engendered by the media misrepresenting the crimes of those he exposed.
Watergate: Nixon was faced with a difficult proposition. There were individuals within his own intelligence agencies who were leaking classified information that looked bad, but only defensible by revealing further classified information. His Plumbers were put together to ferret out the traitors and anti-American operatives in these agencies. Liddy and his men did trace leaks to the DNC, and had Forrest Gump not called the front desk (just kidding) the plumbers might have stopped much of the leaks, thrown many anti-war activists in the Democrat party into prison, stopped much of the anti-war disinformation (Like Conkrite's broadcast that led General Giap to reconsider his surrender after Tet) and as many as 40,000 U.S. soldiers might not have died there.