Am really, really shocked at the minimising. Particularly at people like StarLord who call themselves therapists and who are more or less excusing the behaviour and implying that it's really common. Perhaps StarLord needs better supervision as part of his/her therap work because it sounds to me like her/his opinion is skewed by the type of clients she/he sees, and had become desensitised to what is normal.
As for SolidGold, well, it's SolidGold crap again, isnt it? "Snuff movies don't exist." I thought you always like to make out that us pearl-clutches are the naiive ones? What the hell have snuff movies got to do with racism anyway?
All I can say is if that computer still contained those files, and they were discovered/passed on to law enforcement agencies, then someone would be being taken in for further questioning. Who would it be, OP? You? Your DS? I suspect both.
Does your DS realise this? Does he? The most worrying thing about your description of his actions is his lack of embarrassment, his unwillingness to realise how serious this is. He is completely minimising it by laughing it off.
I can understand people of his age accessing those type of things once, for curiosity's sake, but the fact that a) it hasn't shocked him and b) he is actively now seeking out that stuff, despite the first telling-off you gave him, is very worrying.
I also would like to know what is this wierd behaviour around his sisters you talk of ? That's concerning. There are plenty of mnetters on here who have described abuse at the hands of their brother, are people seriously suggesting that that doesn't go on at that age? It starts somewhere, progressively.
I think a few days at his dad's will help him realise you won't tolerate it in your house. (That's if his dad isn't also into such things, and he's getting access to DVDs or websites there.)
Does he go to school? I would actually request to see the head of 6th form and explain what has gone on. i think that all the students in that year could do with some really good PHSCE type of lessons; maybe see if they could look into the possibility of the local police coming in and giving a talk about the harm it does to the victims in the videos and about what, from a legal point of view, potentially could happen to anyone who accesses it.
Yes, he is still your son. Yes, you should help him. But that help should start with him admitting that what he has been accessing is one step too far.