Have a look at what children were doing at work, and then come back.
In once case I know of, the children in a textile factory worked all day at replacing spent spools of thread on the weaving machines. They were replaced by a machine that did the same thing, at much lower cost.
Are there any jobs at your work place that would be productively performed by children? Have you ever gotten your kids to clean their rooms or do their homework?
Note that the article only measures violations of child labor laws, i.e. there are (presumably many times more) children working without violating the laws. Why are people deliberately employing lousy workers? Why are business owners lobbying to allow these lousy workers to work more hours?
Why do you suppose there was an exemption for farm work? It's because children were needed to bring in the harvest.
Children are lousy workers. What jobs in your workplace do you think they could do? None in any place I've worked.