A YouTuber from Boerne is unhappy that the man who tried to assassinate former President Donald Trump was wearing a T-shirt bought from his YouTube channel. Dr. Matt Carriker is a veterinarian and gun enthusiast whose channel, Demolition Ranch, has nearly 12-million subscribers. After the Secret Service shot and killed 20-year-old Thomas Matthew Crooks, a photo showed him wearing the shirt from Demolition Ranch. Dr. Carriker recorded a YouTube message in which he said he wished he could vet who buys his merch.