Antonin Scalia

I attack ideas. I don't attack people. And some very good people have some very bad ideas. And if you can't separate the two, you gotta get another day job. You don't want to be a judge. At least not a judge on a multi-member panel.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.