c.f. 1066 And All That (Sellars and Yeatman), which used the capitalized phrase 'A Good Thing' to describe historical events which are universally accepted in schoolbook history as having a net positive effect. So, for example, the signing of the Magna Carta was A Good Thing.
Unless you were the King. Then you would think the Magna Carta and its resulting loss of power and position was a BadThing.
No, it was "universally accepted" as a GoodThing. That for one not concerned with the well-being of that "universe of acceptance" it was not preservation of the way things were, does not therefore make it a BadThing. "Universally accepted", however, should not be inferred from that a GoodThing is "popular", for there are times, populations, and places where GoodThings are not popular and BadThings are popular.
On Things
The RightThing may seem like a GoodThing to some but a BadThing to others. I believe that to Do Some Thing about a problem is a BetterThing than to Do No Thing. -- DonaldNoyes