Depends.
On many things but most importantly your government surviving.
For example.
Stalin's ethic cleansing via the NKVD.
To my knowledge no criminal charges were ever filed. It eventually got admitted to, money was thrown around but nothing really happened.
To the world it was just more bad **** done 80 years ago.
Stalin was a monster, not that you'd know it with some of the whitewashing that's been done in Ukraine lately. I read a recent article about how the Russian-backed rebels in eastern Ukraine have essentially rewritten new educational guidelines that basically favor of Stalin in schools.
There was a rather horrific story about how in the Stalinist era, starvation in Ukraine was so bad because of Stalin's policies that people resorted to cannibalism to survive. Apparently, one man's sister was invited over to a neighbor's house but never returned home. They only found out much, much later that the neighbors were so desperate that they'd actually eaten the man's little sister.
Only now, the Russian-based rebels seem to want to pretend that none of that happened and that any pain was shared throughout the USSR (and satellite countries, presumably). Would've been nice if Stalin had been judged for every bad thing that he was responsible for, but such is life. Sometimes you do get away with murder and worse, but that probably only applies if you're the leader of a nation with nukes and could start WWIII if anyone looks at you funny.