The fact that there is another player or team who is in opposition, a group of officials, weather and many other factors that dictate the outcome.
Sometimes there are reasons and not excuses
Sometimes you do well but the opposition player makes an out of this world play.
Here where we are perfect people judging perfection we tend to give no leeway or credit just pass and fail. I think we should always leave room for “dude made a great play” without cheapening it by saying we such or we failed.