Where there is suffering, this has to be addressed, and if a person is genuinely suffering, as determined by the health specialists, then it is right that some funding should be diverted to these cases.
Your comparison could easily be made against childless couples, who are funded for fertility treatment. Some childless couples may well just accept their lot in life, whereas others genuinely suffer.
Difficult decisions have to be made and the experts may not always get it right, but it is right that they try, and that money is made available.
There will never be enough money in the NHS for everything, and so comparisons like yours are inevitable.