There's chess-people's experience of the game, then there's how every single other person, including those who play it quite a bit, experiences the game. A "normal game" in the sense of the average of all games played, maybe that features very few basic blunders, just because chess people play so very many games (though huge numbers of people play a lifetime count of like ten to one thousand games, and never move out of basic blunders being pretty common, so I wouldn't bet on that describing an average game, but maybe) but the average person's experience of the game is that it's entirely about basic blunders, like, that's the main thing on which the game turns.
But even when playing with novices.kids, the aspect of double-attack/defense appears quite often. It's very basic and common consideration really.