For so, so many reasons:
-It can be a way to stop a baby having a health condition that would cost the NHS loads to treat.
-Because why should it only be the rich who can afford to have babies of the are medical issues there?
-It can save the NHS the cost of mental health problems for two people for life.
-At £5k it's cheap.
-The NHS pays for antenatal treatment, scans, and labour/CS and treatment needed afterwards, which can cost £XXXX. If someone can have a healthy pregnancy but just need help with the first bit, why shouldn't they get it? It's cheaper.
-Because women often also get corrective treatment after a birth injury has been repaired so they can have a normal sex life and ergo more children.
-Because for some people infertility is a side effect of previous medical treatment they have had to have.
-Because it treats health problems that people have been completely brought themselves. Eg from smoking, drinking and falling down stairs, overeating, having unprotected sex and getting STDs, driving too fast and crashing, doing dangerous sports, taking drugs, fighting &c.
-Because nobody died of a broken arm, so why treat that?
-Or acne.
-Or wanting bigger boobs.
-Or erectile disfunction
-Or incontinence.
-Or arthritis
&c
BECAUSE THE NHS DOESN'T ONLY TREAT LIFE-THREATENING CONDITIONS.
-Because cancer drugs can cost hundreds of thousands of pounds and only prolong life by months. If it was a cure, they'd do it.
-Because infertility is an illness of the reproductive system, and the World Health Organisation confirms this.
-Because if "having a child is not a right", then why does it pay for people whose pregnancies aren't going well? Just let nature take its course, eh? If it was meant to be...
-In fact, why try and save pre-term babies? Costs £1200 a day. Natural selection, innit.
-And if someone gets cancer/had a heart attack/has kidneys that pack-in/gets hit by a bus then they obviously just weren't meant to live to old age. Just let it be.
I think your OP is a pile of shite, basically.