Sir Terry Pratchett on the subject of both-sides-ism and discrimination:

“Well, there are two sides to every question…”

“What do you do when one of ‘em’s wrong?” The reply came back like an arrow.

“I meant that we are enjoined to see things from the other person’s point of view,” said Oats, patiently.

“You mean that from the point of view of a torturer, torture is all right?”

"There is a very interesting debate raging at the moment about the nature of sin, for example,” said Oats.

“And what do they think? Against it, are they?” said Granny Weatherwax.

“It’s not as simple as that. It’s not a black and white issue. There are so many shades of gray.”

“Nope.”

“Pardon?”

“There’s no grays, only white that’s got grubby. I’m surprised you don’t know that. And sin, young man, is when you treat people as things. Including yourself. That’s what sin is.

“It’s a lot more complicated than that–”

“No. It ain’t. When people say things are a lot more complicated than that, they means they’re getting worried that they won’t like the truth. People as things, that’s where it starts.”

“Oh, I’m sure there are worse crimes–”

“But they starts with thinking about people as things …”