Thread:Love Robin/@comment-25008763-20170711141917

a society like Klowns are imperialistic by design and there is plenty of evidence on-screen, they have invested almost all their non-essential supplies towards warfare and have massive war-ships (the Big Top tent), war-machines (a parade "float" that sucks up victims) and weapons designed to aggressively spread their species at the expense of others (ray-guns that turn people into candy for consumption and popcorn-guns that actually infect people with eggs that hatch into new Klowns, the second is especially imperialistic as it is designed to spread Klowns far and wide).

they are proven as parasites and thus need blood to survive, you don't need to see it on-screen to know they'd require many more worlds to feed on than Earth and they have so many war-machines and gadgets designed for conquest and killing it is clear they are "invaders" and thus imperialist.

they are also confirmed to be ruled by the strongest, at the end of the film they all bow to a giant Klown (Klownzilla) who rules simply because he is the strongest (in fact this "rule" is vital to defeating the Klowns as they use Klownzilla's position to provoke him into a fight).

in short, not original research - all is confirmed in the movie. 