> Okay. In that case, I think I strongly prefer the tax!

I'm reading this as you preferring a moral solution rather than a technical one? You must feel pretty confident that the folks in charge of governing will always have priorities that align with your own.

These are both moral solutions, in my book; the GP has convinced me that one is more effective than the other.

I don't think any such law will ever come into effect. So I don't feel the need to be confident (or the opposite) with respect to my elected officials. It's all wishing.