Your link doesn't help either: it doesn't support your implied claim that TI is far-left or far-right.
While I can't comment on your intent, your reply appears to fit the description of a Bandwagon Fallacy:
The Bandwagon Fallacy (also, Argument from Common Sense, Argumentum ad Populum): The fallacy of arguing that because "everyone" (or someone in power who has widespread backing) supposedly thinks or does something, it must be true and right. E.g., "Whether there actually is large scale voter fraud in America or not, many people now believe there is and that makes it so." Sometimes also includes Lying with Statistics, e.g. “Over 75% of Americans believe that crooked Hodiak is a thief, a liar and a pervert. There may not be any evidence, but for anyone with half a brain that conclusively proves the case!”
But apparently, critical thinking skill is becoming rarefied even at HN.
Perhaps you should put your Rational Debate cap back on and try this again. If I have any say in the matter, truth determination in the Age of Alternative Facts will be more rigorous than ever.
Evidence: A large pool of people who vote on the bias of a site, reported by allsides to be far-left
How is that not supporting????????
(Also, your perception about how the evidence works does not seem to align with the description on the web page. The "blind survey" bit is greyed out, and it says it's based only on "secondary research" and the confidence level in the rating is "low or initial".)
If there was a buzzword contest for 2016 I would nominate "cognitive dissonance". It requires far less intellectual effort to be dismissive of ideas and concepts that produce cognitive dissonance, than it is to wrap ones mind around the petty divisions that weaken our society.
Divided, to be more easily conquered? We could all do with a little Sun Tzu these days. Seems it might put our predicament in context.