Why wasn't naruto adopted when he was young, I mean if he is by himself, the 9 tails power might come out without anyone realizing. If he had a family unit, he would have been able to control his loneliness and therefore maybe helping him control his 9 tails power better.
The general stigma of Naruto having the 9-tails made people fear him. It's a core point of his character development and central to the story of how he travels the path of deliquent ninja - Hokage and the villages strongest.
In reality it would make sense for him to be adopted but in actuality it would ruin the plot entirely.