Need I remind you of the genocide in Myanmar organised to a large degree on social media, or the threat to political dissidents all over the world when authorities or malicious actors can get their hands on leaked, private data of individuals?
Are you seriously suggesting that information in this day and age does not have the power to directly cause harm, including lethal harm, to people?
If Facebook were free and its company had a completely hands-off approach with your data, much like a company that makes paper notepads never looks at what you write, I'd agree.
But Facebook is a company that actively snoops and uses the data of its resources, the end-user. It's like a security guard who's paid to prevent shoplifting actively ignoring violent crimes because it's not related to stealing, or a baby food company ignoring that some metal got into their food because the food is still OK if you pick out the metal bits.
And houses are not free.