whenever you reduce the number of alternatives to two, it sets the stage for vicious partisanship.
So that step one in the Light Arts is to increase the alternatives?
Dunno about "step one" or "Light Arts", but that's usually among my first responses to being offered a forced choice between A and B... what are the alternatives that aren't being considered?
Not so much to avoid vicious partisanship... people can be viciously partisan for their side no matter how many competing sides there are... but because it's hard to consider the merits of options that have been arbitrarily excluded from consideration, and those options often prove viable when their merits are considered.
I am especially prone to this for subjects where certain positions have become popular tribal markers.
Recalling first that life is a zero-sum game, it is immediately obvious that the quickest and easiest path to success is not to accomplish things yourself—that's a game for heroes and other suckers—but to tear down the accomplishments and reputations of others. Destruction is easy. The difficulty lies in constructing a situation so that that destruction is to your net benefit.
The problem with destruction is that it invites retaliation. Even when your talent for lies, slander, and other dirty work is superior to your opponent's, he will still manage to cause you difficulties. When there is a third, uninvolved party, all they need do is stay out of it until you and your opponent have beaten each other down, and they emerge the winner.
It is therefore crucial that you prepare the way for your destructive ascent by polarizing the field into two camps. There must be no third parties or positions. If there are three political parties, you must begin by crushing the weakest. If there are three or more possible opinions on a matter, you must introduce terminology that conflates them and makes it appear that there are only two. Uniting your opponents is not beneficial, but making them appear to be united is, as it allows your attacks to strike them all at once. The vicious arts can thrive only when the apparent choices are first narrowed down to two.
(The mirror tactic is to narrow down the number of choices to one, and present them as two. We shall cover that in Dark Arts 201.)