I'm going to ignore the toxic masculinity and moral obligation rhetoric as they have too much attached baggage. He is being logical in a sense but illogical in others. He will definitely make a huge impact. He has a somewhat broken system that has proven to allow him to overcome ridiculous gaps when employed skillfully. This is something he can and should be aware of in comic. It's okay for him to be a coward it's not my story but I think that makes him less heroic and admirable its really that simple. Ok I will lightly dive into the idea that taking stuff without paying in some capacity is broken and typically draws ire.
In the context of this story I posit he owes his power to the capsule and the people within. If he just takes what he wants and scrams I believe i called him a bitch or coward for those who find the other emotionally charged. I have to respectfully disagree with you on the notion that it is "legitimate to take what you want as long as it doesn't harm anyone else". I am not sure what your legitimacy scale is so I might be off here but I would say a legitimate acquisition is partially determined by the difficulty or risk associated with it. I would include factors such as personal effort, and luck but legitimacy is really subjective to us(our moral values) and the object of acquisition. We have different values, I assume but I want to share this, I think that risk reward is not something that should be dismissed so easily as nonsense. There is a reason adventures resonate with people.