People mistaken #BlackLivesMatter as us/people saying "only ours matters and no one else's" but that's not the case at all. Its a reminder that our lives aren't worthless like the way they're treated. A black kid/woman/person is dead at the hands of a system that is supposed to protect us and the media decides to bring up things like rap sheets and criminal pasts to make it appear as if because they had these charges or records their lives don't mean anything. We say "black lives matter" when we see blacks getting shot up in Walmarts by police for having a toy gun, but then you have white criminals/suspects who aren't met with the same lethal force.
Yes, all lives matter. But yall didn't start saying that until everyone else started saying "black lives matter". Because there isn't really a need for white people to reassure the media or themselves that their lives matter over others cause that's practically been proven, if you ask me.
And for the record, if you actually pay attention to the hashtag other lives are mentioned as well, like TransLives for example, due to the deaths of transgender women that haven't been getting much mention in the news as well.