I've been following this thread (and the larger national argument) since Saturday, and I've noticed two things that seem to be missing. Here is one.
I think too many people are imagining two massive opposing political monoliths, when in reality there are several Left factions, several Right factions, and maybe even some adamantly Centrist factions. This is true even in the contemporary United States, which has an Overton Window much narrower than what is found in Western Europe.
Look, the leadership of the Democratic Party in Washington is not in bed with, for example, the Animal Liberation Front. And the latter probably considers the former completely useless and conservative. Yet they are both characterized as part of "The" Left. Meanwhile, the leadership of the Republican Party in Washington is not in bed with, for example, the National Alliance. The latter probably considers the former completely useless and liberal. Yet they are both characterized as part of "The" Right.
There are plenty of other cases where it's a mistake to see the political environment as having simply two large sides. The false dichotomy obscures significant differences in political perspective, policy goals, and preferred tactics "within" supposed "sides". There are actually dozens of sides, and some of the "neighbors" don't even talk to each other.
Recognizing these distinctions means that critics can't necessarily lump the "centrists" in with the "extremists", and thus people in the more-mainstream factions won't have to feel compelled to defend people they really have no allegiance to. This includes "defense" by tu quoque arguments. It's better to say that "Those aren't our people, and here are our differences with them," identifying some of those significant differences in analysis, policy goals, and accepted tactics. The more that people in the "normal" factions can consistently broadcast the message that they are not in league with the outliers, the harder it will be to use that broad brush. And with a track record of such clarity (in word and deed), even their political adversaries would find the distinctions credible.
Does this sound reasonable? (Perhaps too reasonable?)