system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/MCU] Why isn't Captain America able to wield Mjölnir?

Why isn't Captain America able to wield Mjölnir? It goes without saying that there was obvious comedic value to the scene in Avengers 2, but of all the avengers it would seem to me that Cap is the most moral. 

Could it be because the hammer can sense that Cap's patriotism might skew his perception?
gpt
Captain America could be able to wield Mljolnir, there is no "half worthy" that allows you to budge the hammer. Cap is just really modest and didn't want to upset Thor, the look of defeat on his face when he "can't" lift it looks pretty forced.