- #1
First the MC's attitude: the MC is a teen, but don't think of him as a weak Japanese teen rather think of him as an American teen from like the 90s. He is c*cky, a brat and thinks he knows best, but generally followed authority, at least until authority tossed him aside, thus freeing him. He is OP, and knows it, and as a c*cky teen, it reinforces his attitude, but I don't think he actually knows how far out of the norm he is.
Second, regarding the firing. He was hired to do a job to essentially do stuff with materials and earn the party extra income, and if not doing that, then assisting in the killing. Was he doing the job? Maybe at one time, but by the time of the firing, no, he got too tied up in a side business of helping the country without pay, and for the killing side, pretty sure he had too many resources tied to the side business that probably all he could do was equipment, but a top equipment store, which a hero party should have access to, could probably replace him on that, if they paid attention. Was his firing justified? Yes. Could/should they have done it in a more civil way? Yes. Was his side business important? Yes, but it really wasn't a normal adventurer's job to do. Maybe an adventurer could start doing it, but they really should change jobs after starting to court mage or something along those lines.
Third, his reaction to his firing. Should he have done what he did? Probably yes, if you are not getting compensation to do something like protecting the country, then why should you dedicate all your resources to it. Should he have done it the way he did it? Probably no, instead of all at once, considering the potential impact of doing this, he should have tried to notify the guild or government leadership of the issue, then release or scale back the barriers over like a month or more, giving them time to deal with all the threats or give him a rightful compensation to continue his side business as his primary business.
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