YOU SAID:
I'm all for killing people.
INTO JAPANESE
私はすべて人を殺すことに賛成です。
BACK INTO ENGLISH
I'm all in favor of killing people.
INTO JAPANESE
私は皆、人を殺すことに賛成です。
BACK INTO ENGLISH
I'm all in favor of killing people.
That didn't even make that much sense in English.