Whatever you think you are arguing for, or against, you are still the guy who spouted: "Overall things worked pretty good for centuries before abortions became the norm". You introduced the distorted, sanitized, fairy-tale history and it got shot down.
It was utter BS, and still not backed by a shred of supporting evidence. If 'things worked' even moderately well it's highly likely there would have been little or no support for legal, safe abortion among women. But they have always known "… someone that got an abortion", one that was neither legal, nor safe, from untrained crooks who left many of their victims sterile or with other injuries, if they survived. Women didn't put themselves into hands like those on a whim. It was desperation.
If, as you say "society has come along very well" since legal abortions have been available, then there's no reason to go back to the bad old days is there? And if your argument carries and once again there is no legal abortion, then back-street abortions will be all there is. Going back to the bad old days, that's what you are arguing
for. Even if you don't want to face it.
You asked how bad? Not easy to find stats of secret criminal acts at any time, never mind fifty-odd years back. And 'how bad' is more than a total or two.
Go to any of the first couple of Google hits on 'deaths due to illegal abortion'
The first is how bad things are now: "Some 68,000 women die of unsafe abortion annually, making it one of the leading causes of maternal mortality (13%). Of the women who survive unsafe abortion, 5 million will suffer long-term health complications" That's worldwide, but there's no reason to think Canadian criminal surgeons wouldn't be just as clumsy and incompetent proportionately.
The second is a standard work on women's health by American women and does outline that awful history: "While there is very little relationship between abortion legality and abortion incidence, there is a strong correlation between abortion legality and abortion safety. Estimates of the number of illegal abortions in the United States during the 1950s and 1960s range from 200,000 to 1.2 million per year." Lots more, 19,700,000 hits. You might also narrow it to Canada and find the reference to the Metropolitan Toronto Police Abortion Squad's list of “a number of items which have been used by lay abortionists,” including “knitting needles, coat hangers, home-made sounds, spoons, rubber catheters, plastic tubes, hairdressing combs and slippery elm.”
What's wrong with leaving this issue for the people who have to carry those unwanted babies to term and deliver them? What makes it your business at all?
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PS: Your personal speculation that you "…think women would welcome "Unwed Mother Homes" with open arms today." gave me the best laugh of the day so far. Even funnier than your irrational statement that people of whom you know nothing, must be intelligent and well-balanced because I mentioned them. Thanks for the backhand compliment, but … No, not well balanced.