What's your age range for "child"?

A parent should be training the child for the real world, not simply showing affection. That could turn it for the worse for the kid (I.e. spoiled people or those unprepared for living alone). I have no say in how people parent, but had I the power i would ban everyone from being a parent. But that's not a thing so whatever.

Many don't see killing or abuse as a bad thing. In fact, many societies have promoted such behavior and continue to do so.

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I didnt say Islam is the only way to parent (I dont think it says too much on that topic). Nor did I say to withdraw love, I said not to just only show love and that's it.

You would reinforce your religion on your kids because you theoretically "know" it's true. Why parents care so much is beyond me, but I suspect its due to the modern view of parenting where your kids are your trophies or toys. Im sure reinventing the method of parenting would help resolve this issue and grant greater freedom of choice more effectively, while resulting in less deconversions. Parents suck: its a skill thats never taught and everyone believes is natural; obviously its not. This is one reason im against society-based morals because society is not often very bright.

Why is doing harm bad? There are countless examples and perspectives to indicate that harm can be good. There's a reason why there are so many philosophies regarding ethics. But i can give simple examples: For one, it can instill discipline and promote deterrence. Second, survival of the fittest. Third, self defense and prevention. Fourth, to stop "evil" from taking hold. Fifth, makes the mother happy.