They call themselves "journalists". That article was so one sided it was ridiculous. According to their own guiding principles they state:
Explanatory journalism is a public good.
We believe that when more people understand why something is happening, we’re all better off. That’s why we keep Vox free.
We don’t start with foregone conclusions.
We’re not afraid to make a bold statement backed by expertise and reporting. We explore all points of view with generosity, empathy, and fairness, but we put facts first.
The entire article was a foregone conclusion that guns are bad. There was no balanced presenting both sides of the issue. They certainly weren't providing balanced information so that the reader could form their own opinion on the matter. not to mention most of their points were factually inaccurate,