In the year since electric scooters arrived here, the city has passed increasingly stringent rules for using them, but injuries continue to rise. Last month, the inevitable happened: Brady Gaulke, a 26-year-old Nashville man, was killed in a collision with an S.U.V. while riding a scooter. His grieving parents have started a petition to ban the devices in Nashville. “[E]-scooters are unsafe at any speed, and we are calling on Mayor David Briley and the Metro Council to ban them from the streets immediately,” the petition reads, arguing that Mr. Gaulke should be “the last victim of an epidemic that the e-scooter companies and local government both refuse to acknowledge.”

Rented scooters are now in more than 100 cities in the United States and Europe, and similar stories are playing out nearly everywhere. Last week, a man was killed by a van in Paris while riding a scooter. The week before that, a man was killed in Helsingborg, Sweden, the day after the scooters were introduced. In Oklahoma, a 5-year-old boy died when he fell off the scooter he was sharing with his mother and was hit by a car. Less catastrophic injuries are common, and they range from broken bones and lacerations to traumatic brain injury. “Right now, a stunning number of e-scooter users are getting seriously hurt,” said William Wallace, a senior policy analyst for Consumer Reports.

It’s not hard to identify the problems. In many places, it’s against the law to ride an electric scooter on the sidewalk, and neophyte scooter riders, unlike veteran cyclists, aren’t trained in the safest ways to share the road with cars. All over Nashville, scooters snake between moving lanes of traffic, run red lights and stop signs, turn against the light and generally break every traffic law we have. And they’re doing it all without their riders wearing protective gear: These scooters are available almost everywhere now, and the decision to ride one is often impulsive. Tourists don’t tend to travel with bicycle helmets in tow.

Despite the dangers, scooters continue to grow in popularity, part of what is being hailed as the “micro-mobility revolution.” Start-up companies like Bird and Lime are raking in hundreds of millions of dollars in investment capital, and ride-sharing veterans Uber and Lyft have entered the skyrocketing market.

Cities, though, are often caught off guard when these vehicles appear on their streets overnight. They can scramble to regulate the industry with new laws, but they may not have the enforcement resources to give those new laws teeth. And while there is no question that this country needs a micro-mobility revolution, it takes years to build the kind of infrastructure that would make it safer for people to ride scooters on city streets: Dedicated lanes protected by medians don’t magically appear with an emergency vote by a city council. And people aren’t going to make a habit of bringing helmets with them everywhere until such vehicles cease to be a novelty and become part of a concerted plan to reduce a city’s carbon footprint.

Electric scooters are fun, and joy should never be discounted, but a city needs to be the municipal equivalent of the sober parent, the safety-conscious parent, and either ban the devices altogether or commit the resources to make them safer. Mayor Briley, who is running for re-election in Nashville, has asked for draft legislation that would ban the scooters outright if companies don’t respond adequately to a list of safety concerns.

“I had the opportunity to speak to the mother of the young man who died last week,” he said at a candidates’ forum sponsored by Walk Bike Nashville, “and any time we have that sense of loss in our community as a result of something we have put out there without necessarily thinking it all the way through, we have to go back and readdress the system.” The seven scooter companies currently operating in Nashville have until June 22 to respond.

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