Are there bad parents? Of course. Are all parents bad? Of course not.
Life is just not that simple. Parenting even less so.
Did I say all parent are bad? No. In fact I specifically called out the existence of good parents, and I didn’t even make succeeding in quieting the kid a prerequisite, only the effort.
The good parent/ bad parent public behavior thing really is quite simple. The good ones try, the bad ones don’t even seem to know anything is happening.