The problem here was not the stopping of the theft, which can result in harm. Stopping crime is always dangerous.
There is not enough details in the story to know what happened. Only to lead to the assumption of what we think happened.
We are led to believe someone was initially going to steal, but then does not, and complies after being confronted. But then the guy that complied escalates the situation and things turn deadly.
What words took place. What words from Taylor, from the shooter, from the store employee?
A guy complied and then out of the blue pulls a pistol after complying and becomes dangerous? Why would he have waited and not been dangerous initially?
Something may be missing from the story at this point. In many of these types of stories if the victim did do something wrong it is omitted to keep sympathy high and help lead to the capture of the killer. Keep it good vs bad, and as simple as possible to gain maximum public support.
Was the wife struck and then the shooter continued on his way before being confronted a few moments later by the husband? Or was the shooter still engaged in the conflict with the wife after striking her?
So was it to stop something still in the process, or to confront someone who greatly angered him by striking his wife but was in the process of fleeing?
Also what was the guy yelling when he took out his gun and was waving it? The media is not always clear. Was the guy in fear of Taylor? After putting the beer back was Taylor still being intimidating or bullying the man in a way that caused him to feel trapped or be in fear? Was he trying to detain him?
Did he pull out the gun at this point and this is the :
The man did what he was told and as he was leaving he took a handgun from his waistband and started waving it and yelling at store employees and Taylor. Taylor backed away from the man
Was Taylor not backed away and bullying him before he took out the firearm, but after he put the beer back? Was the man in fear of a much larger Taylor and was using the gun to escape yelling things like "let me go"?
Did the wife not know what was going on, or did she come to assist her husband in bullying a man or detaining him by blocking his path or holding the door closed?
Did she go up to block his path at the door after seeing the earlier problem through the glass storefront (most of those types of places have a glass storefront) with her husband and not realize he had a gun in his hand at that point? Or was she totally naive as we are left to assume and just happened by coincidence to reach the door at the same time the other guy was leaving, after the prior events took place?
None of this is clear, and while it may not change the resulting crime or the attempted crime if that is what it was, it could paint a different picture.