Although a striker missing a clear chance is almost certainly reducing the score by one, so the result (purely based on goal difference in a single match) is the same.
That's where the fan/staff/press mentality comes in I think - it's seen as worse to give away a goal than to not score one, when empirically they're the same thing.
Psychologically it's different to the players to concede, especially if it's from a mistake, and it impacts the game more than missing and the score staying the same.