Chicago Bears

Can someone explain to me how the prevent defense prevents offenses to score? Bc every single time I see a team play this strategy late in a game, all they do is lose. What are you trying to prevent? Offenses march right down the field gaining all the momentum.

If everything is played up front in the prevent defense, how did Jaylon and Eddie get so cooked on that touchdown???

This has to be the worst strategy in all of sports.