If you have reason to believe someone is abusing their children, by all means, accuse them and prosecute them in court.
That is exactly the point.
Then we have no argument. To be clear, what I'm opposed to is the presumption of guilt inherent in the regulatory state in general.
But now you're slipping toward intellectual laziness. There are no true answers to be found on the extreme edges of any issue.
Neither are there true answers found in hedging the middle. We stake out our values and principles where we find them.
Going back to my earlier point, "we the people" i.e. the government/society do have a justifiable reason to interfere in a person's choices regarding their children. It's ridiculous to say it doesn't. The correct thing to say is that there are substantial limits to when exercising such power can and should be used.
By the same token, someone suggesting that the government should exercise such power are not necessarily "statists." And for that matter, the idea you are trying to express is not actually statism. It's more akin to totalitarian fascism. Either way, the point is that such a person does not necessarily want or advocate for the government to have complete and total control over the people.
Indeed it is 'fascism'. And you're right, even totalitarian fascists don't, necessarily, want or advocate for the government to have complete and total control. Sometimes they only shoot for 95%.
The point is, the power you want government to have is far more insidious than simply the power intervene if cases of abuse and neglect. You claim that the state has a compelling interest in the well-being of your children, as though your children, or the potential citizens they represent, are somehow the property of the state; it's this very attitude I'm rejecting. The state belongs to us, not the other way around.