I'm not saying anything here that I didn't say in my response to the cited discussion question.
Long and short of it: this community focuses on helping people -- authors, game developers, worldbuilders, game masters, and so forth -- build their fictional worlds. As such, this community MUST be free to discuss all aspects of worldbuilding, which includes culture, cultural practices, implementations of justice, and a whole host of other activities not all of which are wholesome and pure. We also recognise the need to "reign in" salacious, explicit, gruesome, and violent depictions. Both in queries as well as responses.
As for the five queries you cited:
Nos. 1 through 4. NONE of the questions you cite are worded in anything like a "gruesome" fashion. Every one of them, questions as well as answers, is worded in a reasonably clinical & non-inflammatory fashion.
No. 5 This query is actually based on a YA (young adult) novel. The novel is appropriate for 11 or 12 years and up, as that is its target audience. What's age appropriate for a novel can hardly be rationally considered inappropriate for a query here in this community.
They all focus on aspects of fictional cultures, generally the application of justice and the results (physiological & psychological) of such application.
I'm sorry, but I really do not see what your point is. There is nothing in any of these questions and answers that an 11 year old -- to say nothing of a 13 year old -- can't see in a video game, can't see on Youtube, can't read about in a YA novel, or can't learn about on Wikipedia.
Where to go from here...
Option 1 -- removing the tag "torture". Took a while to discover what "burninate" involves. This seems to be the better of the two proposals. Though I'd prefer it be done through usual channels of community discussion & concensus.
Option 2 -- deleting the questions. This is unacceptable for our community. We must be at liberty to discuss even the darker aspects of a fictional culture. Our mandate is to help anyone who is creating a fictional world with the workings of that world, the evil as well as the good.
As the linked questions demonstrate, you can clearly see that we prefer not to engage in sensationalism. None of these questions go anywhere close to gruesome or sensationalised content. Deletion is not warranted.
We have the right and indeed the mandate to discuss all aspects of worldbuilding, including practices such as torture. We're capable of policing ourselves and have done well when it comes to "gruesome" content, as evidenced by the clinical & dispassionate nature of the questions and answers you cite.
As far as strict or loose application is concerned: it is immediately apparent that this community is unique among the other forums within SE. We regularly deal in content matters that don't often fit the strict guidelines that one finds throughout the other communities. Opinions and broad based questions are vorboten elsewhere. But in our community, this is bread and butter! As a creative and artistic Q&A community, we strive to abide by the quality standards set by SE's other communities as much as possible, but we also recognise the need for leniency and a laxer approach to rules & guidelines.
As such, we appreciate that determining from outside the community what is allowed and what is not allowed is not your goal. Such an action would be devastating to the liberty we require to do our work here and would also further tarnish SE the company. Indeed, when things go to far, we have a strong sense of community and good moderators that are quite capable of handling such situations.