On Friday, actor Tom Arnold tweeted a death threat against Donald Trump Jr. Arnold had previously challenged President Donald Trump to a fistfight. Since Arnold has 250,000 followers, Secret Service warned him that this kind of inciting tweet could encourage his followers to engage in real violence. How much more so a bona fide death threat! Arnold began his attack by tweeting out a picture of Trump Jr. holding the tail of an African elephant he had killed while on safari in 2011. "This is Donald Trump Jr. He is holding the tail of a beautiful African elephant he murdered...