Since we're in agreement about there being a blank there's no real reason to keep going, I've said my piece that I think Mfauli had a point and highlighted which parts of what's shown was hard for me to believe after considering his claims. We both gave real-world examples of how someone could end up outside the system but it's was still just conjecture and not necessarily correct. Simply put Mfauli isn't wrong for questioning how Denji ended up in such a situation since the show didn't adress it.
Sure I buy this, but I'm not sure what you're trying to adress. That I don't think it's Denjis fault or that they didn't put him to work? If it's the latter then I'm not sure how much it of it applies to child Denji since it seems to more reflect his current state. You could say that even when he was a kid he knew he wouldn't run away but I still don't see why they didn't put him to work right away.