We write this letter not to inflame division, not to win an argument, and not to assign partisan blame. We write it to restate a simple, universal truth: Every human being has only one life. This truth applies equally to protesters, migrants, bystanders, and law-enforcement officers. It applies across nations, systems, and ideologies. And precisely because it is universal, it must also place limits on state power.I. When Tragedy Repeats, It Is No Longer an AccidentRecent fatal incidents durin...