Sorry, that's total rubbish.
People have failed to deal with training and behaviour problems for donkeys years, these days more people try to resolve them than just dump/kill the dog, but dogs experiencing problematic behaviour for owners is not new.
I can remember in the early 80s, my parents banning a good friend from bringing his dog over as he (Pepper) had bitten several people (Cocker spaniel) - this caused ructions because other friends dogs were tolerated (my parents were not really dog people but had a soft spot for the Samoyeds belonging to two sets of friends).
I can recall the issue of whose dogs were going to be where coming up multiple times on trips and holidays, despite the fact we didn't have a dog, because many friends did and the places we went were varying degrees of dog friendly/dog tolerant/dog unsuitable.
So even though we were not dog owners or particularly dog people, and were not going to dog-centric events... there were still dogs everywhere, Bearded Collies, Samoyeds, Springers, Border Collies, an Afghan Hound, English Setter, Old English Sheepdogs (multiple, they seem to have been popular in teh late 70s/early 80s)... and crossbreeds of all shapes and sizes - Sweep, short of leg and large of stomach who famously pre-washed the garden table that had been used to butcher the hog roast ... for about six hours! Rex, who treed a squirrel in a Sheffield park... then ran up the tree and committed a very public squirrel murder... Dylan, who was relaxed and lazy until anyone swam then he panicked and had to try to rescue us all... Of course I remember them all as I was animal-mad, but they were there, they were in pubs and homes and camping and came with visitors.... (and all were well mannered on the whole excusing Rex's squirrely faux pas..).
It is just your experience that dogs everywhere is a brand new phenomenon. It isn't actually a fact, at all. I think it's the other way round, the previous couple of decades became less and less dog friendly, so now the swing the other way looks odd... rather than the return to the norm it is.