That is definitely alarming, and a downside of the fedi, but seems like a necessary evil. Unfortunately admins and mods of small communties in the fedi will be the ones exposed to this. There has been better methods if handling this though. There are shared block lists out there and they already have lists that block out undesirable stuff like that, so it at least minimizes the amount of innocent eyes of mods, who are just regular unpaid people, from seeing disgusting stuff. Also, obviously those instances should be reported to the police, fbi, or whatever the heck