This is going to come off really strong. Sorry.
@Ant1989 I'm happy for you that you work with kids, but the fact that you work with kids doesn't mean that you can generalise about them. I meet women, school with women and am a woman, but it doesn't mean I can go around saying "women are incapable of making good decisions" just because it's what I expect of myself or the women I see.
You say that children have not developed their brains to be able to judge consequences well- in that you are incorrect. That is clearly not a physical inability if there are literally children in Mensa, children designing systems of powering whole towns in countries where corrupt adult politicians cannot be bothered to think of ways to do so because they cannot judge the consequences actions like those will have (his name is William Kamkwamba, from Malawi, a child at the time). Those adults cannot do it, but children can. If they are, then how does it make sense to say is it impossible for children to be smart?
If you acknowledge that older people can act like that, then why do you limit your expectations to seven year olds? That is the exact equivalent of me acknowledging that both genders make bad decisions but saying that I expect it of men. Yes, only spoiled adults say things like that- and only spoiled children say things like that too. Just because you were like that or the children you know doesn't mean that everyone has to fit in with your world view.
Do you know what the "Pygmalion effect" is? It's the research-proven theory that expectations influence performance. Google it if you like. You are proof that people expect children to be stupid, so what makes you think inability to judge consequences is just the way children are made? The fact that you haven't met a child who can judge consequences (which isn't even true, unless you're saying every child you have ever met does whatever they want whenever they want) doesn't mean they are not possible. They're just rare because of people like you, who feed the idea that they don't exist.
There are over two billion children in the world, and you have met nowhere near ten thousandth of them. You seem to forget that children are individuals, which is strange for someone who works with them, but they are. There is no one "way children think".
Call it "virtue signaling" if you like, but is that not logic?
TL;DR
Ryan Hickman at 7 began a recycling centre, Jakhil Jackson at 9 began a donation centre for the homeless. Kelvin Doe at 11 powered his neighbourhood using recycled material. And they didn't understand the consequences of these problems on the world?
You're wrong about children.