I think the best thing you can teach a child these days is to question everything. Never accept anything at face value especially when something like a certain narrative is obviously being pushed from all directions. Also, teach them to be the best observer of others they can possibly be. Tell them to watch other people very closely and the decisions they make, specifically to see how those decisions turn out. Teach them to avoid mistakes in their own lives by noticing the consequences of them in the lives of other people so they don't need to end up living those consequences themselves.

Don't spend too much time trying to protect their eyes from seeing or hearing what is out there, teach them how to live and function in the midst of it. Don't preach too much, because children naturally rebel against being told what is. Ask them questions and talk with them about troubling events that come up in daily life. Listen to how they are interpreting the event and then ask them questions to get them thinking about a different healthier perspective. That way they feel the understanding coming from within themselves instead of coming down from an authority figure. If you completely protect/isolate them now, they will just end up shell shocked when they leave home and have total freedom handed to them and the world hits them in the face.

Also, help inspire and support them in any aspect of life they are interested in which will give them more independence, skill, and self-sufficiency from the government, a future employer, a technology, or other people.