Because in sexual harassment, a manager is responsible for the behaviour of their reports.

Because it is the most common way for an idiot to open up the company to hundreds of thousands of dollars of liability.

Because it is the only concern that is a constant, regardless of which industry you work with.

When you're in the medical industry, managers have to take medical compliance training. When you're in the financial industry, managers have to take financial compliance training. When you're in the automotive industry, managers have to take OSHA compliance training.

But in all of those industries, there is one common element. Managers have reports. Reports that can sue the company, if their manager engages in harassment, or allows another employee, customer, or contractor to harass them.

Widespread feminism amongst courts, HR, employees and consumers. HR matters are almost fully handled by feminists who believe in rape culture. The courts, specially in California, are ideologically biased to believe the accuser and punish everyone involved. Merely a sexual harassment accusation is sufficient to provide a catastrophic blown to the reputation of the accused and the company. In other words, Google has social pressure from consumers, judicial pressure from courts and internal pressure from employees, all derived from feminist beliefs, which ultimately result in a financial incentive to stand against the issue.

Apparently, the expectation that your boss shouldn't proposition you for sex = feminism.

Also, recognizing that a quid pro quo relationship is inappropriate at work = also feminism.

Have you considered that work is for people to go to, so that they can do their ing jobs?