Why NOT "All Lives Matter"?

If "Black Lives Matter" actually means "black lives should matter as much as any other lives", then why is there so much visceral hatred toward the reply "All Lives Matter", which literally *says* what "Black Lives Matter" *means*?

Ebooks: https://www.smashwords.com/profile/view/MikePartyka
Follow me on Twitter: https://twitter.com/MichaelJPartyka
Follow me on Gab: https://gab.com/MichaelJPartyka
Follow my blog: http://mikespeakshismind.com/