Zuck wants to remake the internet by his rules https://www.washingtonpost.com/opinions/mark-zuckerberg-the-internet-needs-new-rules-lets-start-in-these-four-areas/2019/03/29/9e6f0504-521a-11e9-a3f7-78b7525a8d5f_story.html

Neither Zuckerberg nor governments should be deciding what happens on the internet. This is a very top-down style of thinking.

He probably by now knows, as the article indicates, that he can't solve the moderation problem without breaking the business model. So he's trying to find ways to externalize that to governments and make it somebody else's problem/cost.