@Baysiri
Ignorance and stupidity are two different things. Being ignorant about something simply means you don't possess the knowledge about that thing. You can't be expected to know something you've literally never even heard of before. Stupidity is having knowledge but choosing to ignore it. Like touching an electric fence even though you
know it's an electric fence. Some people are stupid and do things like that. So far, he doesn't possess the knowledge that the people are not anywhere near as strong as he thinks they are. He needs to see more and be told more before it sinks it. Simply being told that a few times isn't enough to actually gain the knowledge that what was told to him is the truth. He first needs to realize that it's the truth, after which he'll have that knowledge. Then, after knowing that, if he's still all "There's no way my parents could have lied to me!" and whatever,
then I'd consider him stupid.
But still, I'm not saying you're wrong or anything. My previous posts were just my own view on things. For all I know, the MC could literally be called "stupid" in the very next chapter or something. I'm just saying from my point of view, I don't think he's stupid, considering his situation