There's a third choice, though. It's bad when speed limits are much lower than the natural speed of the road, for the reason you describe. And it's good when the natural speed of the road is the safe speed of the road. But in addition to those two, it's also possible to introduce fast, automated enforcement— speed cameras.
This, of course, applies just as much to the actual topic of the Economist article; new inheritance taxes are just and good, but they should be written to be enforceable, and then they should actually be enforced.
The old meaning of the word "deprecate" meant to "pray against," or "to pray for deliverance from". As a software developer, I have always found this fact amusing. Software becomes deprecated not when it is actually limited or removed, but when the developers and maintainers begin to pray that God will deliver them from it.
From what I can tell, the polls were just really bad. Less than 1% response rates. This provided hope for various sides at various times but at the end of the day they basically aren't that useful.