The enlightenment is simple: People do not have objective views, and never have full access to all the data, and all possible opinions.

Instead, people have subjective views.

Not only that, but words themselves carry more meaning than their direct definition as well, only complicating the matter.

To say, "The right thing to do is to treat people as if they were equal." is different than, "The right thing to do is to treat people as equals." isn't it?

So there are ways to say the same thing in a way that sounds reasonable, and a way that could sound hostile.

A person can say a fine idea nicely, or with cruelty.
Or a person can say a terrible idea nicely, or with cruelty.

So even if you think something is objective, it might very well be just a nice sounding idea that doesn't have any obvious flaws, even if the idea itself is unsustainable or malicious.