You are free to personally disagree with iNat’s guidelines for the use of the term captive/cultivated/wide and also free to read the extensive comments from staff and other users about how to use the DQA on iNat that are already present on the forum. However, all users should follow iNat’s guidelines for using the DQA according to what these terms mean when it comes to their usage on iNat itself.
The guidelines are very clear that observations meeting the OPs situation, like
“butterfly mounted in a display case and not appropriately marked with date and location of original collection”,
should be marked as captive/cultivated/not wild.
The example that you provided of your scorpion matches one of the examples in the documentation for “Wild” quite well:
“snake that you just picked up (yes, it’s in your hand where you intended it to be, but the place and time is where the snake intended to be)” especially as the true location is within the accuracy circle of the observation. If the date/time/location of the observation are where the observation took place, it is fine to have a photo taken later and have the observation be Wild (as the guidelines specifically note) - this corresponds to your example of the snails. Though I would suggest noting that the photographs were taken years later, as sometimes coloration and other traits that can be important for identification can change over time.
However, in the OP’s scenario, the observation was located in Manchester, England (not the site of original capture) with the date/time at the present day (when the observation was made), not the original capture of the scorpion. This directly corresponds to the guidelines for downvoting in the DQA as Not Wild.
Also, it is not necessary to describe other users’ attempts to help explain iNat’s guidelines as “foolishness”. It’s possible to express disagreement without insulting others.