The problem is proving it; everyone in rural areas know of things that occur "outside the law" and exactly who did it, but there's no court-admissible evidence.
Court admissible evidence is more likely to turn up when it's front page news and people are digging though.
Same with the recent story about a famous pub called the Crooked House, which mysteriously caught fire a month after a new owner took over the closed premises and was demolished remarkably swiftly. Because it generated a lot of outrage (not from regular patrons, but from people who liked how it looked), it got more attention than your average arson where the owners were obvious suspects, and sure enough there have been actual arrests as well as rumours about other fires involving the same owners and evidence of demolition equipment having been leased the day before the fire
Rumours about organizations behind the incident are normally in local pubs rather than national newspapers though. The last couple of arrests were only today, with three more released on bail. Proving it in a courtroom is another thing, but it sounds to me like more resource than would usually be thrown at investigating a fire in an empty building.
Rumours in the pub and rumours in the paper are no different in the court of law. Has any evidence been brought forward and has anyone been charged with a crime?
Rumours in the national press are a lot more influential in allocating police resources to finding evidence and interviewing suspects than rumours in the local pub.
Not really sure why you're continuing to insist on a Sherlock Holmes style resolution where everyone's been charged and all evidence is in the public domain within the first couple of months, but what is evident is that it hasn't been abandoned like it often would have been by now.
You said that "Court admissible evidence is more likely to turn up when it's front page news and people are digging" and then used this as an example. I'm asking because it doesn't seem to actually be an example of what you're claiming.
Same with the recent story about a famous pub called the Crooked House, which mysteriously caught fire a month after a new owner took over the closed premises and was demolished remarkably swiftly. Because it generated a lot of outrage (not from regular patrons, but from people who liked how it looked), it got more attention than your average arson where the owners were obvious suspects, and sure enough there have been actual arrests as well as rumours about other fires involving the same owners and evidence of demolition equipment having been leased the day before the fire