Why are parents so arrogant

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What does /pol/ think? I don't know if this has been a thing since the 50s (like old people hating teens), but why do so many parents (or people aged 40-60 in general) act subhuman at when it comes to their kids. (Especially at sports)

Examples

>When I was 16 at a college baseball game, I caught a foul ball and some fat mom tried to lecture me about not giving it to her 4 year old son.
>Multiple videos of skateboarders getting yelled at on Youtube.
>At one of the last Little League baseball games I ever played, I was in the dugout and at a baseball field adjacent to ours, I saw two moms get into a fist fight over a dead ball.
>A bunch of dads got the football coach at my school fired.
>There was an attempt to fire the baseball coach as well, but I think he's leaving after this year so it doesn't really matter
>Some mom refused to listen to the guy at the ticket booth about how gruesome Logan was, of course, she ignored him, and about 2 minutes after the start of the movie, she left in a hurry.
>I was running late to school and I pulled in going 22 (in a 15) and the mom in front of me slowed down to 4 mph and got in the center of the road so I couldn't pass her. Some mom in a minivan chased down my friend in his pickup truck because "he passed by her too fast" and tried to take his phone. (to call his dad I think?)
>There was some thread a while ago about how some mom went nuts over her son's boy scout troop shooting BB guns and in the process of complaining about them, after yanking a BB gun out of her son's hand, she shot some kid in the head.

Something they do that causes my blood to boil is say the most disrespectful things ever to young people and act shocked and angered when they snap back. Are there any other examples or explanations /pol/ can provide?