UNSC weapons compared to normal humans

Does anyone else find it amusing when the scientists are trying to fight off hunters with these UNSC weapons that are almost as big as they are? Why wouldn’t UNSC make weapons that are normal size instead of the making guns that only fit in the hands of Spartans. Even in the new Nightfall movie, the ONI soldiers looked ridiculous holding the assault rifles and DMRs.

Bigger guns = MOAR POWA!