Why doesn't Garen argue with his wife?

He doesn't want his marriage to become a Kat-astrophe that leads to divorce

Nice, thought you were gonna say because he always silences her. GJ for proving me wrong :D

Because he has no wife. evil grin CALLED DIBS ON KAT!!

You can't argue with a girl who will slit your throat.

Haha, wasn't aware of the lore regarding Katarina :)