[cloudsloth]

I think it's a great slogan. If everyone (society at large) aleady believed all lives matter then it would be a dumb slogan. It's a great slogan because currently black lives don't matter in many people's eyes. In my experience the only people who don't like the slogan either don't think black lives matter or are absurdly blind to the reality of racism in this country.

The controversy isn't because it's a bad slogan. The controversy is evidence of it being the correct slogan.