Critics of the international movement have called it discriminatory and racist, citing it as an attempt to prioritize black lives over all others ("It's not just black lives -- all lives matter!"). And perhaps most significantly, many have accused the organization of inciting hatred and violence against police. Though these assumptions are completely false, the discovery of a co-founder's tweet talking about killing white people does nothing to quell these criticisms. Rather, it simply adds fuel to an already raging fire.