They need to tell themselves that "data privacy" is a non-issue because otherwise they would have to take responsibility for feeding Facebook/Google all of their users for many years, which directly resulted in fake news laced political advertisements which micro-targeted voters in the presidential elections.

The book "careless people" clearly documents how Facebook engineers were embedded in the Trump campaign to run fake news advertisements micro-targeted to US voters.

It takes a lot of strength to resolve such a fundamental cognitive dissonance, especially if your self image is the talented techie who made money without hurting anyone.