But you have to remember that for that every home owner whose quality of life diminishes there are 100's of renters whose quality of life increases because they can live in a neighborhood they wouldn't have previously been able to afford.
For a majority of cases if the original home owners hadn't settled and allow infrastructure to mature around their investments then the density would likely not have increased to the point where re-zoning was viable. (At least that's the pattern I see in Australia, where we are at a much lower density across the board)
