Nah if you wanted to prevent the genocide you need to kill the perperators until they stop. Blaming the channel for genocide is as facile as blaming encryption for crime since in both cases they could talk to the same people to plan crimes. Genocide occured when humans were hunter-gatherers stop blaming the tech for it.
That's not prevention, though, that's punishment after the fact. Prevention requires doing something about it in the very early stages.
(yes, this is a pre-crime argument, but crimes against humanity committed by and on behalf of states or warring ethnic factions are qualitively different from ordinary crime.)
