The Left think that teaching kids how to be responsible is "grooming" because they believe that responsibility is an ideological construct.

Fundamentally, I think that the Left can't imagine how to teach kids morals and values without teaching them ideology. For the most part, it can be done by educating your kids on experience and tradition (terroristically conservative), rather than starting with ideological precepts and working forwards.

There may be a limit to this, as teaching kids a religion will likely imbue them with a form of ideology if you are not careful about how you teach religion. Obedience to religious doctrine without allowing them to learn about the theology itself is closer to grooming, rather than a proper religious education.