Let's get rid of the term, "socialization."
“Sociallzation.” It sounds lovely, doesn’t it? When humans talk of socializing with each other, it carries a connotation of “party” or at the very least icing on the cake of the day-to-day routine. “Socializing” when referring to puppy development is, however, so crucial to their long-term well-being that it should be renamed “survival training.”
Unsocialized or improperly socialized dogs tend to be fearful. Fear is the primary cause of aggression. Aggressive dogs have a hard time thriving in human society. It’s plain and simple.