Obviously it's not the whole picture, but I think the most quantitative answer is that the human resources field is one of the most female-dominated out there (source: http://www.bls.gov/cps/cpsaat11.pdf).
In companies I worked, they make a lot of them. HR is part of the panel that votes on a interviewee's fit and also handles a lot of the salary negotiation (which is as important as the whole hiring process).
I also detect a 'for programmers' added in that wasn't present before...
Handling salary negotiations means being able to say 'yes we accept your offer' or 'no, we don't think we can make that work'. That is making a decision.
They don't even do that. The company positions HR people between candidates and the hiring manager as a way of thwarting negotiation, but the HR person is invariably required to escalate back to the hiring manager if they can't get to "yes".
The idea that women have an outsized role in tech job screening because of the demographics of HR is totally specious. It also has nothing whatsoever to do with Rayiner's point.
The notion that HR has any meaningful role in selecting candidates is fallacious. Any appearance of such a role in an HR organization is a deliberately constructed artiface, intended to take the heat off the real decision makers and to trap candidates with poor negotiating skills.
