That depends on whether it's a blanket "not my child" or parents are involved, aware and see little opportunity that their son is on this kind of path.
I would be astonished if my son had even a table knife turn up while I raid his room for used socks because he's dyspraxic and hates using any kind of knife to the extent of still using plastic ikea knives for dinner.
He doesn't have parcels.
He doesn't have any drive to go out and about unsupervised.
There's been no changes of mood or character to indicate getting drawn into social situations (in person or online) that he shouldn't.
He uses the computer in a public room and the algorithms are very much focused on science, engineering and maths. His access to the internet has been managed and supervised carefully from the start. We discuss boundaries, why they're there and what to do if you come across inappropriate content online, especially if you've done something daft.
He's not socially motivated and prefers quiet, studious people. He favours alone time at home and isn't swayed easily by peer pressure.
He has physical hobbies, sporting and creative that he does throughout the week.
He's grown up in a stable, respectful home with positive role models. He's always had parental time avaliable to him.
So at this point in time, I don't see any motivations or opportunities for him to go down this kind of path in life. It's a path I've been aware of for a long time due to safeguarding training and seeing issues flagging up in a small town school of varied catchments. I've worked in inner cities, in leafy suburbs. Leafy suburbs tend to be the worst for denial, but all areas have their problems. These issues have always existed in some form or another, but the last 15 years have de-localised them.
I'm not in a sudden moral panic because of a TV drama, I've been aware of these issues for over a decade and have parented accordingly. For my son, the greater weak spot would be online content due to his autistic social skills/ drive rather than in-person contacts. I can't say never, but I don't see evidence that he is that way inclined, and statistically it is a minority that go that way. It's not a male default; also females get tangled up in these cultures and behaviours too so it's a general parenting concern.
So sometimes when parents feel that their son isn't being drawn into these cultures, it's not a self-protective denial, it's through awareness and not detecting signs of it. MN parents are more likely to follow current affairs, be aware of safeguarding issues and be pro-active parents than average.