There is a relatively far line from 'free speech' to 'free speech that actively encourages discrimination, harm of others, or infringing on others rights' As a

There is a relatively far line from 'free speech' to 'free speech that actively encourages discrimination, harm of others, or infringing on others rights' As a private platform, Facebook is free to curb the topic you have suggested, in the same way you are free to avoid said private platform.