Scenario 1:
You go for a walk in the forest and enjoy your afternoon.
<Zero economic activity.
Scenario 2:
You drive around in your car to get an ice cream and run over a child riding a bike. Thankfully, it only breaks a leg and doesn't die, but the child's leg and bike are broken, the car needs repairs.
>Ice cream and sugar industry sales
>Bike shop gets to sell a new bike
>Car repair shop gets business
>Hospital gets business for treating the child's leg
>Insurance companies increase rates
>In short: Lots of economic activity, solely created by suffering