My wife and I both wish we hadn't bothered having children, and I personally wish people were more mindful in bringing children into the world. But I don't see it as immoral. By that logic, not only should we not have children, we should all kill ourselves immediately, because dead people cannot harm, or potentially harm, others. I don't see any endpoint for antinatalism that doesn't involve either the end of the human race or a lot of frustrated antinatalists who don't get their way or convince hardly anyone of their rightness. Seems like a waste of time and an expression of hyper-idealism.