If they turn to lethal weapons then political support for them would probably break down very quickly, especially from foreign powers.
Actually, no corporations have really commented on the matter as far as I know, so they're not even being hypocritical. There is so much money on the line, it would have to get incredibly bloody before anyone would do anything, so I think China has lots of leeway, and I've seen nothing to indicate they're not incredibly sharp.
That lethal force against protesters leads somehow automatically to breaking down of political support is wishful thinking. Do you really need a list of countries who regularly use lethal force against protesters and are good friends and partners of western governments? When it comes to a state killing protesters all that matters is who the state is.