system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU/Earth-199999] Why would Steve Rogers NOT be worthy enough to wield Mjölnir?

In the party scene at Avengers tower we have a bit of fun seeing the other Avengers trying to pick up the legendary hammer of Thor. Stark and Rhodey fail, but Steve Rodgers is able to nudge the hammer a tiny bit, much to Thor's surprise and concern. It's a hint that Cap might have a bit of what it takes to be worthy. But why wouldn't he be?

The hammer carries the inscription/enchantment "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor."

Now, what is takes to be "worthy" is pretty vague. In Thor (2011), the God of Thunder loses his powers as he is deemed unworthy due to his arrogance and vanity. He is able to reclaim the power when he faces The Destroyer (as a mortal) and pleads with it to take his life instead of the humans he's decided to protect. The Destroyer strikes Thor and he seemingly dies. In that moment, Mjölnir decided Thor has proven himself and returns to him.

I understand Tony and Rhodey being unworthy. I'm sure they've done some unsavory things in the past (we know Tony has). But I would argue that Steve has proven time and time again that he's at least as virtuous as Thor. He has shown he is willing to sacrifice himself for others, and has never shown any signs of arrogance. Even before he was given the super soldier serum, he was willing to jump on a grenade to save his fellow soldiers. And since then, he's fought evil every chance he's gotten. So if the only requirement of being deemed worthy according to Mjölnir is to be willing to put others before yourself and to not be vain, why wouldn't Steve be able to fully wield the power of Thor?
gpt
Another idea that could make sense is that Mjolnir is a weapon of *destruction*. Thor and Beta Ray Bill, and others who have wielded it are *warriors*, they relish the violence of battle. They're good guys, sure. But they're kind of rageaholics, to be honest.

Captain America, on the other hand, has a pure, compassionate, selfless disposition and this translates to his style of leadership, fighting, tactics, etc. 

Basically, Mjolnir *may not* consider Cap worthy in terms of granting him the power to destroy, for which Mjolnir was forged. Captain America at his core is not about POWER and OBLITERATION. He's about LIBERTY and TRUTH and ultimately, PEACE.