Your question just as easily could have been "Why are Democrats into redistribution of wealth?" My answer would be similar to my answer about Religion. You have to look at the history and origins of the kinds of phrases they use, and you'll find they come from economists and philosophers - and mostly the socialists of the late 1800s and early 1900s. Terms like "economic justice" and so on... Note: Democrats weren't always into redistribution of wealth, that is a relatively new thing from the New Deal Era. For the most part, up until the 1960s, they were the party of Slavery and Jim Crow and the KKK.
There were more than one tribe of Indians, FWIW. And those tribes had some of the bloodiest wars without white people around, and before the New World was "discovered"... They had their own brand of slavery, torture, and other forms of brutality.
It's a control thing. I think more and more young people feel the same as you. I know I do. I think as time goes on you won't see it be as a big deal as it is now or so I hope. I personally agree with you. I don't agree with someone's religion but if I think he'll govern better I'm going to vote for that person.