Can they write 'Purple lives matter'

"There have been several recent instances of people crossing out "black lives matter" and writing "all lives matter" on the walls at MPK," Zuckerberg said in the post. "This has been a deeply hurtful and tiresome experience for the black community and really the entire Facebook community."

What color matters the most? Well, there are very few purple people, so one might think rarity adds value.