Garbage collectors have always existed. That's not true for shocking videos. Youtube and other social networks need to be held accountable for creating the incentive to produce such content in the first place. The impact on their own employees is only the first sliver of harm they are enabling.
The "incentive" to produce most shocking content is mostly due to the video sharing websites being free and open; even if there were no recommendations or subscriber feeds on YouTube, they would need this content moderation job since the same people would be uploading the same stuff.
