The countries which don't accept the current legal system have every interest to undermine its legal system by questioning it, spreading FUD, nitpicking on how it isn't perfect, playing the history card about colonies, and everything else from the dark triad handbook.
If countries such as China and Russia would recognize ICC, then these instances would've been investigated. For on paper they are worse than Srebrenica. The reason nothing happened with regards to Tibet is because of China's soft power. Same regarding Russia and Georgia, and if USA and IL are in cahoots with the Axis of Evil the West's soft power diminishes because the USA was the one keeping it all together. Hence you see the rest of West's defense industry scaling up.
If countries such as China and Russia would recognize ICC, then these instances would've been investigated. For on paper they are worse than Srebrenica. The reason nothing happened with regards to Tibet is because of China's soft power. Same regarding Russia and Georgia, and if USA and IL are in cahoots with the Axis of Evil the West's soft power diminishes because the USA was the one keeping it all together. Hence you see the rest of West's defense industry scaling up.