If Kellermann's data pool were a 50/50 split of urban and rural households, he would never get the results he intended because so many of those households would own guns without anyone being murder.
This is why epidemiologists, pollsters, quality controllers and statisticians exist. Nothing is fifty-fifty. And you can't poll everyone and you can't test each and every part and you can't ensure every side is evenly distributed.
The fact is Kellermann controlled for owning v renting, rural v urban, poor v affluent and a ton of other variables. TS still refuses to read the study which indicates he either cannot read or doesn't understand what he does read.