What do you think children should do instead?
Compulsory education wasn't brought in at a time when kids otherwise could choose what to do, stay at home, go travelling etc.
It was brought in to solve two problems:
1, to replace work. Children worked before we had compulsory education, and part of the reason of bringing in mandatory education was to change this and replace manual labour with something actually useful and humane.
2, to allow all children to access education - by making it compulsory and forcing the goverment to take on the responsibility of educating all children, you set up a system where all kids no matter how rich/poor have a somewhat equal start to life. Before we had compulsory state-funded education the rich were educated, the poor attended sunday school inbetween days of manual labour.
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There are plenty of good arguements about when compulsory education should stop. 16? 18? 21? 14? etc.
But to abolish it entirely is just foolish. If parents really don't like state education they are free to educate their children at home. One my cousins is home schooled and that's her parents choice, and perfectly allowed by the goverment. But to remove the requirement that children are educated is very badly thought out.
What else are they going to do? Work? Is that the country we want where a family can choose to send their 10 year old to work? Because there are struggling and poor families that will, and if you make it societally exceptable to have kids work, there are companies that will exploit it - we know this, because it happened before, and still happens in other parts of the world. So they aren't going to work? What else? If they aren't in education, and they aren't working, they are just doing nothing? That's not good for them either..
Honestly this thread sounds like a kid who just doesn't like school trying to find a way of justifying it.