Hair dryers become a fire hazard above certain temps, same with the tea kettle. Septic toilets can overflow if not properly sized and done on the cheap in neighborhoods. Fences fall over, trash in your yard impacts house values of your neighbors that you can't recoup, width of doorways affects handicapped access as well as impedes egress during fires. I used to service homes affected by disasters so I've seen a lot of these first hand because we're in an area with a lot of houses built before the regulations. Regulations clearly provide value, especially when protecting property and safety rights that either are unlikely to be recouped or aren't able to be effectively proven otherwise.
I absolutely HATE neighborhood associations though. What you're growing in your front yard, who you have over for guests, what outrageous color you paint your house, none of that impacts other people nor contributes to overall safety of others.