You're exactly right. And who could be more involved than the parents who are taking the job of educating their kids on themselves? And who could be more lazy than someone who takes advantage of the free government daycare for ages 5-18?
Even unschooling parents can be highly involved. Parents who are constantly looking for opportunities for their kids; listening to them so that they can help them find more resources--those are the involved parents. If your child says something like "I wonder how the Mongol hordes handled traveling with women and children", then you go to the library, or a museum exhibit, and you find out. Or if they are amazed at fractals, then you find interesting, out of the way math books for them.
Unschooling is *not* unparenting or unteaching. In its most effective form, it's more like coaching. It is great for kids that are particularly gifted. This is where you get people like Chris Paolini (author of Eregon).
There are approaches to homeschooling that are very unschooly in the beginning, precisely to get kids excited and self-motivated about learning, and not for the little gold star or free pizza. But really, truly excited about learning for its own sake. Those approaches then get more structured as the child gets older.
I also agree that something needs to be done about our schools. I thought that a full decade before my first child was even born. I've been waiting for 20 years for them to be fixed, but I decided not to sacrifice my own kids while waiting. So we homeschool.
Do I have the necessary knowledge? A lot of it--and what I don't have I can hire out. There are tutors, co-ops, distance courses and courses on DVD. My oldest is 12 and is currently studying programming, formal logic, Latin (raises SAT scores, to be pragmatic), algebra, etymology, 9th grade general science. He's writing a novel and wiki articles for fun. He plays with his friends in the late afternoon and evening for a few hours every day; usually bikes or skateboards or sometimes baseball or football. I'm hoping he can start taking college classes in a year or two. He's in several clubs and will be doing Junior Achievement this year. And he was mostly unschooled until he was 10--taught himself to read at 5 and to multiply at 4. Which was one big reason I started looking at homeschooling.
To equate unschooling with "making ignorance a virtue"--now that's ridiculous.