Do We Have Jurisdiction to Prosecute Non Indians in Indian Country?

In magurt versus oklahoma, as well as in some previous cases, the court of said states don't have presumptive authority under current federal law. They can opt into jurisdiction under certain conditions and under agreements federal governments and with tribes. Oklahoma systematically used its state courts to deprive indians of their property when oil was discovered on their lands. There's a long history of this. And then finally, you say we have to worry about blood quantum when it comes to victims. Well, wouldn't that also be true when we have to deal with defendants? Is apparently not a worry there.