But doesn't that cut both ways? Can't the PC crowd then also martial their own supporters to spend five or ten minutes clicking around to vote for the books they feel better represent "good" science fiction? It would be an even playing field, and the side that gets the most votes wins.
Since we're sort of assuming that the current "culture war" being forced on SF/F has American roots, I'm going to make some observations with regards political movements in the US.
First, I'm not on board with the term "PC crowd," as I think "PC" is an overly emotive term that tends to obscure more than it illuminates. But of course I'm not blaming you or anyone else in the thread for that--I'm just saying why I think it's the wrong term to use.
But regardless, historically speaking, movements on the hard end of the political left in the US (and in many other societies as well) tend to have "mobilization problems." They are, almost by default, riven by factionalism, doctrinal disputes and petty rivalries. The sharpest knives, it seems, often face inward.
The hard right doesn't have that problem--it's knives, as a general rule, face outward. Rather, the hard right's problem is that its views tend to be seriously unpalatable, even in the US, where the center is somewhat to the right of where it is in other industrialized societies. Hard right movements are a historical constant in US history, but they cluster regionally (in the South and "mountain West," as well as in small pockets elsewhere) and routinely struggle to expand beyond a 20% threshold. But they have sufficient mobilization capacity to dominate the news cycle and threaten to "take over." The hard left in the US simply does not.
I think that dynamic is reflected in the US side of SF/F fandom. I believe, from observation, that most SF/F fans are either casually supportive of left causes (like greater visibility for women writers), don't really care one way or the other, or are unaware of the politics. But very few are
committed to the causes. A larger proportion, I suspect, are
committed to hard right causes, or to
opposing the pursuit of causes by the committed left of fandom, but it's still a relatively small proportion of the overall field (say, 20% to the hard left's 10%). So if we are talking mobilizing the hardcore, the hard right has big advantages over the hard left--not just in numbers, but also in mobilization capacity. However, if we are talking about the entire field, as it stands, then I see the left having some big advantages there, in the sense that the casual version of their causes
do resonate more broadly. And so, when casual versions of left causes take root, they can garner more support than hard right opposition can (and still, I'll note, among a minority, given the large chunks of fans who either don't care about or are unaware of the issues). But that's soft rather than hard left.
Notable, in US fandom as well as US politics on a larger scale, it often seems as if the hard left and hard right ultimately aim the sharpest knives at the soft left.
I probably got muddled in which points I was addressing. My apologies. I've not had enough coffee and my brain is somewhat useless anyway 
