I think you're stretching things to make your point here (admittedly a difficult temptation to resist!).
"Survive", for example. True in general, but we want our projectiles to do more than merely kill deer: we want to give them a quick, humane death, and for them to be recoverable from close to the strike site.
Then there's "chest shot". We just had a frank and interesting write-up on here of a muntjac that received a chest shot that was (probably) brisket-only, resulting in a deer that remained too mobile to be recovered. Did it survive? We don't know, because that particular chest shot didn't achieve the desired outcomes of a quick, humane kill and a simple recovery.
As for being overregulated by government, isn't a large part of the point here that Scottish regulations are looser than English ones (i.e., no minimum calibre), even though an apparently unintended consequence is the exclusion of large, slow, projectiles that require accurate range estimation or short engagement ranges.
Government may often be ignorant, but I'm sure we can agree that not all citizens are as sage as SD members, and that the wider the public, the higher the idiot quotient. It's conceivable that at least some laws are drafted with this in mind.
