This is utterly ridiculous. The majority of teens I knew watched a few hours of LiveLeak at some point and turned out fine.
Yeah and you for sure know what went through all of their heads.
If a kid enjoys it it's a very big red flag. If a kid is horrified by it (as I was) even if pretending to be cool in front of peers, then there you have your answer as to what it must feel to do it every day 9 to 7.
a few hours! Watching it for 40+ hours a week for months on end is going to fuck you up more than a casual perusal of a shock website.