I wonder though - what if you can't hold the line?
Here in Canada we have had a recent scandal around assisted death, which is legal here. This was a fairly recent change, and brought in with all kinds of safeguards against abuse in the legislation.
As soon as it was passed two things started happening. The bodies that had pushed for the law began to come out with emotive stories to the public about how these safeguards caused situations where people were not able to access this "right."
And then they took some of these instances before the courts, to argue that these safeguards were in fact illegal - if people had the right to choose to die, you couldn't deny it on grounds of things like mental illness. So that law changed.
We now have documented cases where people have pursued assisted death because they couldn't stand the idea of being locked into a care home if there was another covid lockdown, or where someone thought it was a good idea to suggest assisted death to a person looking for help with persistent depression. The latter not strictly speaking a change in regulation but clearly indicated some change in what people feel about the nature of what makes a life worthwhile.
Anyway - to sum up - I increasingly wonder if it's always possible to get a grip on whether a thing is right on it's merits, without understanding that making that change will fundamentally change the way people think, and they will then follow that change to it's logical conclusions.
At this point I'm also not very sure that any of the big social changes of the last 60 years included that kind of long term projection.