@Tabathatwitchett No need for a "but". Yes, decent parents support the school their children go to, no question.
Personally, I don't think it needs to be a huge argument.
I home educate my children because I believe, for various reasons, that that's the best fit for them; I know many others who do it because, really, they have no choice (lack of SEN provision, overwhelming bullying, whatever); I know that some people think that some home educators do it because they feel strongly that It Is Better Than Any Other Option And Demonstrates Their Innate Superiority And The Specialness Of Their Children. That may be true for some; not for any of the people I know personally.
Some send their children to school because, for various reasons, they believe it is the best fit for them; because they have no choice (SEN that the parent can't cope with without professional educational support, family finances, whatever); I know others who do it because they feel strongly that It Is Better Than Any Other Option And Demonstrates Their Innate Superiority.
Meh. Horses for course, YMMV, and all those things. Like someone said upthread, we all do what we do because we think it's the best option for our families. I wouldn't judge anyone else's educational choices any more than I'd judge their career choices, their choice of transport mode, or their favourite kind of music. There are plenty of equally valid ways of doing things, all the way from boarding school to unschooling.