Not sure we can confidently state how the shooter feels about firearms one way or the other at this time. As of right now, we know the rifle used in the murder was an x/years_old family heirloom that was given to the suspect as a gift but the police have not shared anything substantive beyond those details.

We are likely to hear more about the shooters position on firearms at a more granular scale at trial as prosecutors build a profile of Robinson that will be presented to the jury.

Violent crimes are generally impulsive - the accessibility of the firearm absolutely lent itself to the murder occurring but being in possession of a rifle, in general, doesn't offer much genuine insight beyond speculation.

Accurately shooting at a distance suggests active practice rather than passive indifference wrt firearms.

And yet they frequently cannot. Wind, drop, ammunition, breathing all matter.

If you like I can link to an ULR shooter targeting 24 inch plates at 5,000 yards and yet missing soda cans at 150 through 450 yards.

Practice and experience are evident in a single shot at 200 yards.

He didn't need to make the shot a dozen times in a row, only once.