I think it is worth pointing out that the article selected for ‘review’ is not entirely typical of the site (most articles seem to discuss lived experience, activism activities and how to get by in unfriendly circumstances rather than philosophy or logic per se).
Additionally, the Facebook thread for the article has a lot of discussion, dominated (in my view) by self-described “SJW”s who had big problems with the anti-rationality stance of the article and made strong arguments in favour of logic and reason.
This article show that the bias of some SJWs against reason is impossible to strawman.
The emphasis is mine.
I think PhilGoetz does not strawman the author of the reviewed article, but by going on to say:
But it isn’t just a sign of how irrational the social justice movement is...
does strawman the social justice movement as a whole.
Note: Edited in the first couple of minutes to fix formatting problems.
No secret information is required for Harry to come to his conclusion of “So you really are his one weak point. Huh.”
Available evidence:
Lucius is well known as a hard bastard (initially supplied by random customer, reinforced by Draco)
Draco is well cared for (he is healthy, very well dressed, displays no social anxieties, worships his father)
Draco is probably indulged or even spoiled (Draco’s behaviour)
Draco is being groomed to be Lucius’ successor and therefore his equal (very clear by this point)
From this evidence it can be reasonably concluded that Lucius loves his son.
For a hard man like Lucius, this makes Draco his likely weakest point.
Lucius is simply underestimating Harry’s ability to make good use of the available information (and possibly also underestimating how much Draco has given away while trying to cultivate Harry).
EDIT: 25 Jan 2012 - I just noticed that a previous incomplete revision of this comment appeared below by accident. It is now retracted...