Extreme is related to Bright. Bright is related to Strong. Strong is the opposite of Regular. 
Person wants (to) Evidence. Argument is a type of Evidence. Argument is a synonym of Controversy. 
Extreme <--RelatedTo--> Bright <--RelatedTo--> Strong <--Antonym--> Regular 
Person --Desires--> Evidence <--IsA-- Argument <--Synonym--> Controversy 