No, federal laws against murder are not invalid, because they only apply to federal personnel and federal property under Article I Section 8.
A military base is under federal jurisdiction/authority: "Congress shall have the power ... to exercise like authority over all places purchased by the consent of the legislature of the state in which the same shall be, for the erection of forts, magazines, arsenals, dockyards, and other needful buildings."
That's my logic, what's yours?
“No, federal laws against murder are not invalid, because they only apply to federal personnel and federal property under Article I Section 8.”
It doesn’t matter to whom they apply. Federal personnel are (or should be) US citizens, protected by the Constitution. If the Constitution forbids the Congress to pass laws against murder, then any murder laws it passes are unconstitutional.
Trying to trick me? After I point out that the portion you quoted is irrelevant, you pull out the “...exclusive legislation in all cases whatsoever..and to exercise like authority over all places purchased....” bit?
I’m done here.