Conservative pundit Charles Krauthammer, too, has weighed in on the connection between redskin's power to offend and its origins when he compared it to the derogatory verb gyp:
...Originally Posted by Charles Krauthammer
Nonetheless, it is easy to see from 19th-century newspapers that the term did frequently appear in the context of violence by and against Indians. Stories about life-or-death encounters with hostile tribes can be found by searching redskin in Chronicling America, the National Digital Newspaper Database.
But the informal usage of redskin seems to have made it especially inviting to the creators of frontier tales.
Such contexts and, more importantly, the violent history of U.S. Indian policy, help explain why the 1898 Webster's Collegiate dictionary labeled red-skin "often contemptuous," as Peter Sokolowski of Merriam-Webster has pointed out. But our lexicographical take on the word remained complicated.
In short, this article presents many views on the word, you only showed the part you wanted.