alt Hacker News> For most Americans, A house is their primary savings account, retirement plan, and probably where they keep majority of their wealth.
If you allow for increases in density, that house (actually the land beneath it, but still.) becomes more valuable as it's redeveloped. So that American homeowner does benefit, by unlocking the upside of "evil gentrification" (or actually, density increase).
That can only happen if the higher density coincides with equal economic growth in the neighborhood. Otherwise, the higher density could result in a negative home valuation trend.
Given the above uncertainty, and higher density could result in more traffic, noise, crime, nymbys are likely taking the correction position for wealth preservation and quality of life.