Two cheerleaders were shot in a Texas parking lot after one, Heather Roth, got into the wrong car. One of her teammates, Payton Washington, was also shot. Both girls survived, with injuries.

In Cleveland, Texas, a father asked his neighbor Francisco Oropesa to stop shooting his gun on his porch because his baby was trying to sleep. Mr. Oropesa walked over to the father’s house and has been charged with killing five people, including an 8-year-old boy, with an AR-15-style rifle. Two of the slain adults were found covering children, who survived.

At a Walgreens in Nashville, Mitarius Boyd suspected that Travonsha Ferguson, who was seven months pregnant, was shoplifting. Instead of calling the police, he followed Ms. Ferguson and her friend into the parking lot and, after one of the women sprayed mace in his face, according to Mr. Boyd, began firing. Ms. Ferguson was rushed to the hospital, where she had an emergency C-section and her baby was born two months early.

And sometimes there is no gun. On Monday, Jordan Neely, a Michael Jackson impersonator experiencing homelessness, was yelling and, according to some subway riders, acting aggressively on an F train in New York City. “I don’t have food, I don’t have a drink, I’m fed up,” Mr. Neely cried out. “I don’t mind going to jail and getting life in prison. I’m ready to die.” Was he making people uncomfortable? I’m sure he was. But his were the words of a man in pain. He did not physically harm anyone. And the consequence for causing discomfort isn’t death unless, of course, it is. A former Marine held Mr. Neely in a chokehold for several minutes, killing the man. News reports keep saying Mr. Neely died, which is a passive thing. We die of old age. We die in a car accident. We die from disease. When someone holds us in a chokehold for several minutes, something far worse has occurred.

A man actively brought about Mr. Neely’s death. No one appears to have intervened during those minutes to help Mr. Neely, though two men apparently tried to help the former Marine. Did anyone ask the former Marine to release Mr. Neely from his chokehold? The people in that subway car prioritized their own discomfort and anxiety over Mr. Neely’s distress. All of the people in that subway car on Monday will have to live with their apparent inaction and indifference. Now that it’s too late, there are haunting, heartbreaking images of Mr. Neely, helpless and pinned, still being choked. How does something like this happen? How does this senseless, avoidable violence happen? Truly, how? We all need to ask ourselves that question until we come up with an acceptable answer.