They have that right, and I don't question it. I just have never understood the reasoning behind exercising the right.We are guests on this forum, of an owner who has chosen not to allow discussion of certain subjects. Chosen, as is his/her right as owner.
My own sense so far is that it's far easier to state and enforce a zero-tolerance policy, and that the automotive topics ban came along to get rid of a flood of grey area discussions on those topics. Just like any outright ban, it often looks silly but the advantages of a ban are still valid. Auto mod? Out. No thinking, no meetings to confer, no time spent mulling it over.
There are still plenty of grey-area discussions here, and they're handled on a case by case basis as far as I can tell. Members here are fairly acute at sniffing out dangerous projects.
I think it's reasonable for the owners to not want discussions here of overtly dangerous stuff like rail-guns, although I don't buy into the premise that this protects anyone. The automotive ban is just a hammer applied where applying a scalpel would be too time-consuming.