guillotines are for chopping heads whatever the perspective. The big question here is why ???
I would think they serve as a metaphor... In this part of the world, we used to call it "Sticking it to the man"... Now, after so many people are waking up and realizing they have been victims of an alien abduction (another metaphor.. politely implying the gnarly probing by our gov), perhaps its a way to express one's desire to cut the offending beast's head off... (Yet another metaphor, depicting battle in revelations). I merely speculate.