Lawsuits are silly. They won't go anywhere. If that was reasonable we could all sue our own governments.
We all know that it will go nowhere, but it will hopefully be a wake-up call to the Chinese dictatorship that they are accountable to the rest of the world. For god's sakes, they sit on the UN security council.
Best way we could send a clear message is boycott their goods. Although that will hurt the Chinese people, it might wake the masses up, so they start protesting against their self-imposed leaders.