'A plague o' both your houses!'- Mercutio, Act 3, Scene 1
'Boy this shall not excuse the injuries that thou hast done me; therefore turn and draw.' Tybalt, Act 3, Scene 1
Shakespeare criticised futile conflict and sought to encourage a more peacful society.
Context around conflict:
Conflict around male-dominated; men fought for their honour, status and respect. Men were expected to defend their family's honour at all costs- and would fight to the death to do so.