Society tends to observe almost any mistake of parents as reasons to remove children.
24/7 surveillance of children is an unreasonable expectation. Yet if there is any lapse observed, no matter how minor, it's an investigative offense. There is little understanding for parents. Not many people are parents these days, and if they are frequently they only have experience with one or two children in a world where every child can be quite different.
When CFS shows up, you are mostly at the mercy of the org. I've called attorneys and they kind of throw their hands up with a "not much they can do attitude". There isn't much due process except what exists internally to the org. When they make mistakes there is effectively no recourse except going public and shaming them in the media - which is not generally effective BTW.
Which brings is to harm. Removing a child from a home can be life altering dramatic. Yet they can do it without judicial oversight. The places they put them aren't guaranteed to be superior. Even if a child experiences some abuse they may also experience love in a home. Foster homes are also actually more likely to be places of abuse - https://www.focusforhealth.org/sex-abuse-and-the-foster-care...
So the metaphor that comes to mind is you are potentially removing a child from a pan, maybe not even a hot pan, and likely throwing them into a fire. To make that step you had better make 100% certain in triplicate that you are correct. And that bar is not met by the current system.
I'm not really sure how to convey a lifetime of experience as a parent and personal dealings DCFS and what is and isn't good for children. Children are, nearly universally, better off with their actual parents if those parents want them. Even when those parents demonstrate pretty egregious failings. Unless there is really solid proof of physical danger to their life directly from the parents or sexual abuse, it should be hands off.
The foster system just isn't good enough to justify anything else.