Let is the opposite of Support. Support is the opposite of Opposition. Contrast is a type of Opposition. Conflict is a type of Contrast. 
Violent is related to Fight. Fight is related to Argue. Argue is a synonym of Contend. Contend is a synonym of Cope. 
Let <--Antonym--> Support <--Antonym--> Opposition <--IsA-- Contrast <--IsA-- Conflict 
Violent <--RelatedTo--> Fight <--RelatedTo--> Argue <--Synonym--> Contend <--Synonym--> Cope 