That's demonstrably untrue: there are articles at the top of Google results about this very subject including a guide on how to do it on The New York Times that references the breaches.

https://www.narcity.com/news/canadians-are-deleting-their-fa...

Anecdotally I deleted mine over privacy concerns but it was prior to the breaches. My wife didn't like the fact that friends of friends could see photos of her. She didn't know those people and didn't like it. I was more exasperated by Facebook tweaking privacy knobs through updates and was always to share more not less.

So I deleted my account since I couldn't promise that even if I choose privacy settings today that protected her privacy they'd be there tomorrow. Ironically she's still a Facebook customer and has no clue how to change privacy settings, but that's between her and Facebook.