The problem comes when folks float rivers and take game off of private lands that they Do Not Own or have permission to hunt. When your shot crosses a property line, you are illegal in Texas. Its just how it is.
Some landowners actually like feral swine. I know as I work for a fella who owns a piece of land infested with them. I started trapping them. He asked me to stop for fear of trapping them all out. Cant make that kind of stupid up!