Zoning, a 100-year-old body of law intended to preserve quality of life that in some cases maybe went too far:http://www.nytimes.com/interactive/2016/05/19/upshot/forty-percent-of-manhattans-buildings-could-not-be-built-today.html?hp&action=click&pgtype=Homepage&clickSource=story-heading&module=second-column-region®ion=top-news&WT.nav=top-news&_r=0 …
"we've got enough, let's not overdo it" has unintended consequences. You have to explain, compare, judge the trade-offs.