Zizek concerning sitcom canned laughter:

Why this laughter? The first possible answer –that it serves to remind us when to laugh – is interesting enough, because it implies the paradox that laughter is a matter of duty and not a spontaneous feeling; but this answer is not sufficient because we do not usually laugh. The only correct answer would be that the Other – embodied in the television set – is relieving us even of our duty to laugh – is laughing instead of us. So even if, tired from a hard day’s stupid work, all evening we did nothing but gaze drowsily at the television screen, we can say afterwards that objectively, through the medium of the other, we had a really good time. (Zizek, Slavoj The Sublime Object of Ideology. p. 35 Verso, 1989)

Is canned laughter also of the fake smile or the fake laugh that people do?

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Is justice always the goal of hate?

Yes. We only feel hate as a result of believing in evil where evil is defined as causing harm, knowing it and not caring. IOW we Only feel hate in the face of indifference. Through curing this indifference there can be justice.

Point being Zizek claming on pg 92 of Violence that hate is so much worse than indifference basically.

Hate is an attempt at justice and hate is at least correctible. Indifference not so much. But it's the acceptable thing in society. As it can't be helped so much. And indifference generally only kills indirectly.