It's sad that defending yourself and your property from robbers is often vilified in the west. There is a 0% chance the police were going to find and return his property.
Most countries require an appropriate level of force for self defense. Killing someone for stealing your money, especially after the fact when they're already running, is usually not part of that. And neither is Turkey part of "The West". Erdogan made damn sure of that not going to happen any time soon.
The state has a monopoly on violence for a reason. Imho. this wasn't self defense, this was vigilantism and killing two people over money is a break with civilization.
Something similar happened recently here in South Africa, a woman bumped the thief with her car. He didn't die though, and she wasn't prosecuted. People are sick of crime here
Who cares. Don't rob people if you value your life. This is particularly pertinent if they are armed; and good luck telling who is concealed carrying or who realizes the 1-ton machine they are at the wheel of is a damn fine weapon.