It kind of is. When there are other fields which both a) employ more people and b) have a much larger "problem," it's valid to ask why the laser-like focus on tech.
Pointing out other problems in other fields does not absolve tech industry of any responsibility.
This is a tech site. It's going to focus on tech wages. Other sites are focussing on the gap in motor repair or restaurant chefs or whatever.
EG https://www.google.co.uk/search?q=gender+imbalance+education...
Although using WSJ proves you right: https://www.google.co.uk/search?q=gender+imbalance+education...
Who said there's a conspiracy? There's no more a conspiracy against the tech industry than, say, people who vote Democratic are a conspiracy against the Republican Party. It's just a large number of people with similar opinions and self-interest. Unfortunately, in this case the emergent result of that large number of people acting in their own opinion and interest is a lot of unjust attacks on innocent people, dismantling of valuable concepts such as meritocracy, and a distorted view of the industry in the popular imagination.