Dan Gillmor: We have an obligation to use our cameras to record, even if we may not be a part of what’s happening

Diamond “Lavish” Reynolds’ video about the last minutes of Philando Castile’s life teaches us an important lesson about our responsibilities, Dan Gillmor writes: “We all have an obligation to witness and record some things even if we are not directly part of what’s happening. That’s what two people did as they captured videos of the killing of Alton Sterling in Baton Rouge, La., last week. They understood their duty when it comes to holding accountable the people we rely on to protect the public in honorable ways. … At this point I’m convinced, as Ethan Zuckerman says, that we have an obligation to use our cameras in these situations, among many others. These are times when a video record of what happened may not provide absolute clarity, but at least it can provide data.”