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Yea, but unfortunately Russia is one of the handful of countries on the list of countries that international law does not apply to.
We need to send Ukraine some more ammunition. >

Even with evidence it will be a moot point if the accused remain hunkered down in lavish bunker in Moscow. >

Not so...
Establishing the facts through due process changes the narrative. The way articles are written in the press, news reports, the way people discuss events... changes from allegations to facts.
Before Girkin was allegedly involved with Ukrainian separatists in the downing of MH17. Now Girkin is guilty of downing MH17 and we know the area was controlled by the Russian military. Russia is also failing to deliver this guilty person.
It makes it easier for people to make decisions against Russia, like more sanctions against Russians, more weapons to Ukraine, and so on. This brings about a quicker end to the war and more favourable result for Ukraine.
(Largely influenced or even paraphrased from Snyder) >

thousands more like, much more yet to uncover.