Is All Lives Matter a legitimate protest for equality?

In 2013 policeman George Zimmerman was acquitted of murder, after shooting black teenager Trayvon Martin to death. Many saw this as an example of racially motivated police brutality, and symptomatic of wider racial prejudices in the West. As public outrage grew, "Black Lives Matter" (BLM) became a rallying cry across the internet to protest against these injustices. The "All Lives Matter" (ALM) movement mobilised in response, seeing BLM as an affront to non-black rights. This has divided people. ALM argues that achieving an equal society requires inclusivity, and that focusing only on black lives is misleading and offensive to non-blacks. Meanwhile, their critics see the ALM movement as proof that black lives remain unequal. It is regarded as a problematic campaign. One that gives non-blacks license to distract from the uneven levels of inequality and prejudice faced by black people, and undermine their cause. With public figures including Richard Sherman , Ben Carson and Tim Scott active supporters of All Lives Matter, is it a legitimate protest for equality? Or does this campaign only deepen existing prejudice?