What about the idea of killing someone just because his excrem

What about the idea of killing someone just because his excrement
(shit and piss) is too smelly?
Can you please help me to solve this question in my daily life?
Hullo everybody, im from china and am studying here. What i found
good about Australia is the good sunshine
and the good trees, but referring to the people.. hmm.
i am living with several people in a house, within which one guy
is from Australia (an undergraduate student), but his excrement
is so smelly that the ceiling fan doesn't work and it gets
all way out through the whole house, and is indispersable.
And i don't know how to get started talking to him. Because
Australians are difficult to communicate, from us chinese' point
of view. When the people from us two countries are talking
together, it's like we are talking about two completely different
things and no one knows what the other side is talking about.
Now all my desire in my mind is to kill him, coz i just can't
stand, and i begin to realize how tragic it is to study in Australia.