You know, I didn't notice this for some reason, but the name of the species of brutes, (Jiralhanae) sounds exactly like "Being retarded" in Korean. Trust me, I know, I'm a Korean.
When you punch off their armor, or just shoot it off etc...They actually become retarded, not berserk. (No offence to the AI designer...) There are a lot of developers from the country, as I have seen from credits. Coincidence? I think not.
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The word "Jiralhanae" is a Korean word (지랄하네), meaning something in the league of a "stupid aggressive lunatic" (which almost perfectly describes the Brutes aggressive personality). ^ Straight from halo.wikia.com (Halopedia).