At the Copa, Copa America ('24)

SystemShock said

There's an old adage in futbol: penalty kicks aren't blocked, they are missed.
For the life of me, I can't understand how a professional soccer player can miss a penalty kick. All the advantage is for the kicker. It's a very short distance, and a very big goal. You either kick it high, or very low, and you kick it hard, as simple as that.

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Mental aspect.

Another old adage: "think long... think wrong ".
Players take too much time to set up, stare down, stutter step etc. And end up psyching themselves out.

I think if they would just rely on their skill, block out everything else, they would be close to 100%. But fatigue both mental and physical has to play some role. Especially for defenders who exert a ton of energy both physically and mentally.