Children grow into taxpaying adults, so no it is not inherently fair to tax parents for effectively having children. In fact encouraging children would by default increase long term stability and, if the birth rate is such, increase tax revenue long term.....
So all those single people will have someone to continue to pay taxes so they can enjoy healthcare/pensions/bus travel/etc when they are no longer productive enough to finance themselves and need state subsidies.....
To be clear, I am not saying that parents should be heavily tax. I understand the value of future generations of well educated children.
i was merely supporting someone's assertion that in other countries children are effectively taxed to cover the increased costs, and that in general this makes sense.
And these child taxes are not to cover 100% of the cost of the children, the whole of society will pay taxes that will be used by children. just that taxing parents a little extra because they have children is done in other countries, it does make sense, and the results are positive.
Children are very expensive and it is sad that in the UK some people just do not care about the financial impacts of the child and let society pick up the pieces.