It only took them 1865 years and several hundred thousand casualties to reach this conclusion.
Unless you are talking about Quakers. But then, I've been on threads where Quakers were not considered real Christians.
Perhaps it took Christians so long to abolish slavery because the Bible supports slavery in the strongest possible terms, and forbids slaves from disobeying their masters.
You aren't familiar with Christian doctrine are you? All men are sinful. The bible is clear on that. You can't judge Christ by the sinners he saved. "The heart is deceitful above all things and desperately wicked; who can know it?" Jer. 17:9 That only reinforces Christian doctrine which our founding fathers clearly saw in forging separation of powers and checks and balances. That's also why all are doomed to judgment without the righteousness of Christ.