So why do most of the kiddie winkies from the past 40-some years think they need to start EVERY sentence with the word, "So"?

So it's NOT needed and it makes the user of this bad habit sound really stupid!!
So I just watched a 90:00 video, an interview, and every answer this guy gave started with the word, "so"!!

So why do most of the kiddie winkies from the past 40-some years think they need to start EVERY sentence with the word, "So"?
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