In expounding the Constitution of the United States, every word must have its due force, and appropriate meaning; for it is evident from the whole instrument, that no word was unnecessarily used, or needlessly added. The many discussions which have taken place upon the construction of the Constitution, have proved the correctness of this proposition; and shown the high talent, the caution, and the foresight of the illustrious men who framed it. Every word appears to have been weighed with the utmost deliberation, and its force and effect to have been fully understood. No word in the instrument, therefore, can be rejected as superfluous or unmeaning.
Chief Justice Taney, Holmes v. Jennison, 39 Pet. 540, 571 (1840)
The problem is in the meaning placed on the words and those whose agenda is to undermine the federal government postulate that the 10th overrules all the rest.
My understanding of it is that it can do NOTHING contrary to a federal law and ONLY has application within a state which affects none in other states.