I am not making an argument in favor of federal law enforcement authority within the states. My argument, one that was understood by the founders and was the basis for the expansion of the United States, is that as a property holder, the federal government was entitled to manage that property.
The BLM is assigned management authority. They are abusing it, to be sure, but that is driven by the President of the United States and his Administration. The issue of federal law enforcement authority is another question. Your point seems to suggest that you believe that they are one and the same.