Presume we do, or presume we COULD, if this sort of thing is ubiquitously denounced?
Democracies don't "work", we "work" them. You ought to be ashamed of yourself, talking about it as though you were helplessly seperate from it. All your nihilism does is accommodate bullies.
To build, you need permitting. To get a permit, you need permission from the municipality. If the neighbors believe they will be adversely affected by the new building, they may petition the municipality to reject the new building or make them alter the plan, at which point it becomes a political issue, not a private home life issue.