Of course. We pay taxes, we're entitled to something back for them too.
Also, we might be able to afford them now, but if we lose our jobs, we won't be able to afford them. Better to be cautious, use state education and use any extra money for extra/super curricular activities. It would not be good to have to remove your child from a private school during their GCSE years!
And as a pp said, private schools are not always better, anyway. They just keep the (poor) riffraff out, which is the main reason parents want to use them (don't keep the rich riffraff out of course, our current PM springs to mind).