Political theory is useless at school. At best children would be totally lost in the plethora of ideologies without proper understanding of why people invented them. At worst they would be indoctrinated with the ideology, chosen by the government (usually the case).
What we really need to teach children is decision making and responsibility taking. School is to obsessed with learning the facts omitting scepticism and problem solving whatsoever. Kids are being taught recipes, not how to act when you don't know the right one.