Teachers do NOT teach morality. Abortion is a perfect example. To you it's immoral today, so as it pertains to abortion, did the morality change? Not for you. It's not my place to teach that slavery is immoral to my students, but I must teach the conditions of slavery without overlooking them. Even as I teach about the greatness of Washington, I must also teach about the conditions of his slaves. Just because the majority of people at the time believed that treating Africans as animals, doesn't mean they were animals now does it? I mean what are you seeking here paxxx? You want me to acknowledge in class that "slavery was widely accepted at the time"? Of course I do, it's impossible not to.
The majority of the German army thought it was acceptable to gas millions of Jewish men, women and children.....does that mean it was morally acceptable at the time?
Slavery during the 1700's was already addressed as morally wrong by many, the Constitution of Vermont addressed it, Pennsylvania as well. England had already addressed the immorality of the practice, Russia, and Portugal as well.
As long as you provide the context of the times. It is impossible to judge figures from 250 years ago based on today's values. As we stated previously, morality changes over time.
To state that slavery is immoral is true today. It was not true for most of society in the 1700's. There were efforts underway to change the minds of Americans about slavery during that time and during the 1800's. It finally succeeded. And we lost hundreds of thousands of lives abolishing it.
But as my original post pointed out, snowflakes want to rid America of many Founding Fathers because they were slaveholders. I hope they keep it up.