UK- Is it fair that 100% of the benefits of having a child go to the main carer?

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When parents separate, the government refuses to split the benefits and tax credits equally between the aprents (since April 2003) and gives 100% of the child benefit, child tax credit and all the passported benefits to the main carer, 91% of the time it is the mother. The father gets nothing and has to pay up to 25% of his net income to the 'child' support agency. Do you think this is fair? What if the parents share care equally - in UK it is irrelevant - the benefits and tax credits cannot be split. What do you think?