We don't have a TV. Perhaps because of that, I notice them in public spaces and have a harder time ignoring them than other folks. They're over the checkout stands at a local grocery, and over some gas pumps.
Today I went to the local branch of a bank whose name rhymes with "Smells Cargo." I have to do business there every month or so. The previous time I was there, I noticed that they had installed a TV above the line of tellers, so the folks waiting in line would have something to pass the time. When a TV is set up in a public space such as a bank or airport terminal, it has to be set to something anodyne, so the set was tuned to some sort of vintage-1950's -60's TV station.
The last time I was there at the bank, there was an episode of some cowboy drama, featuring an armed bank robbery.
This time, it was an episode of the Lone Ranger, featuring an armed bank robbery.
It could be taken as evidence that violent TV programming does not have any effect on behavior, as everybody else in the considerable line was ignoring it, and I was unarmed.