There certainly were war crimes and ethnic cleansing in Croatia, but the Serbs claim 1,200 civilian casualties. The Croats claim there were only 120. And from what I read, the discrepancy is more in characterizing what’s a civilian, not how many casualties. That’s compared to 8,000 dead in Srebrenica.
If you’re arguing people didn’t know about Operation Storm, you’re just kidding yourself.
Also, it wasn't 8000 summary executions in Srebrenica at the time. That's another one of those magic growing numbers of dead the Bosnian Muslim's PR company was so adept at changing as the mood struck them.