If there’s any soul-searching among top television executives about onscreen violence contributing to real-life tragedies like the Connecticut school shooting, it isn’t readily apparent. All say the horrors of Newtown and Aurora, Colo., rocked them. But during a series of meetings with reporters over the last 10 days at the TCA winter press tour, none offered concrete examples of how it is changing what they put on the air, or if that is necessary.