We're discussing a group of 10-13 year olds in the year 2020.
Consensus is against because of a horrific crime happening to a 7 year old, small enough to be pulled from a sleeping bag, 25 years ago.
Ctimes like this leave their mark on society because they are that rare. (I remember the case at the time. I thought it was a few years later actually)
Beavers sleep in tents on camp from 6 with leaders in nearby tents, Brownies from 7. Scouts and Guides 10+ plan their own camps with some mentoring from their leaders. They are on scouting/ guiding camps, but they're hardly military bunkers for security.
How many millions of nights have children slept in tents safely since 1995?
14 year olds do the Duke of Edinburgh's Award, lugging their tent across the countryside with minimal supervision having to navigate their way. (It might even be 13 for younger children in the school year- many start in y9)
My children are 7 & 9.
We have an enclosed garden. They sleep in one tent. I sleep in the other. The house is unlocked for toilet access or just changing their mind. We've done this for a few years.
I stay out for my 7 yo. I would be happy enough for my 9yo to stay out with peers of his age or older.
When I was 16, there was a high profile murder of a 17 year old 1 mile away from my house. The murderer was not convicted for another 6 years. A few years later, I used to walk past the spot and indeed much of her final journey on my own, in the dark in the winter on my way to and from work, and see the memorial based upon her A-Level art. What happened to her was horrific too, but you can't live in constant fear of the worst case scenario. It was something I was always mindful of, but never let it constrain my life.
There have been female runners mugged on one of my regular running routes and sexual assaults within a few miles (main offender now behind bars for a long time, but there have been others). I still go out and run albeit with an alarm on my wrist. I still go out and walk quiet routes with my children despite the attack/ murder of the Russells.