Regardless of the politics of it 
… just about everyone in this forum wants to own their own hardware. That means noone anywhere for any reason gets to operate a remote kill switch on your computer - unless it’s operated by you yourself because your computer has been lost or stolen. So we are all in furious agreement.
Even if someone thought that remote kill switch is a good idea … “silicon trojans” raises more questions than it answers.
Can I audit this silicon trojan code?
What other functionality is in this silicon trojan code?
It isn’t entirely clear to me to what extent this topic is a theoretical discussion. Does the silicon trojan already exist? The Intel homunculus CPU probably goes close.