It is the default myth where all specifics can be imagined or presented earnestly in a learned TV programme. Many assumptions go into this including the idea that our ancestors needed some convoluted religion instead of some connection with the world around them. Anyone can project their fictional quasi-religion onto what our obviously ill educated ancestors thought, it is so easy, like a mirror.
I wonder if in 5000 years time there will be people making similar observations regarding airports and placing their own idea of what our primitive religion must have been to have created these things, making connections regarding the orientation of the runways and some variant of the Mayan calendar.
Stonehenge is a gift that keeps on giving for the industry that surrounds it. People that are involved on this gravy train are up there with firemen and nurses in that their work is so much more worthy than that of your typical office admin worker or shop assistant.
I mean, who wouldn't want to protect England's most treasured monument?
Meanwhile the more interesting history of England does require some intellectual curiosity rather than idle thoughts about embellished mystery. Stonehenge invites tourists in to engage with some mystical bullshit. Who cares that there are many, many other vintage monuments and stone circles in South West England, there for anyone with a proper Ordnance Survey map and walking boots to discover and enjoy. The thing is that Stonehenge creates a spectacle, other neolithic stone circles are just that, some stones in a circle and can be seen as that without having to go into some quasi-religious awe.
Also quite useful for this awe and wonder is that most things from pre-history was made from bio-degradable materials. Our ancestors could have had the most amazingly crafted houses with furniture made from willow but we would never know they just louched about on comfy willow couches as all that remains are a few things like Stonehenge, meaning that BBC TV programmes insist that everything was all about some mystery religion.