I doubt that the amount of tax you are paying is supporting anyone much unless you earn about above £50,000 you are basically being supported by those so called millionaires. I suspect that to be contributing anything you need an income of about £60,000 and then its marginal what your contribution is. in other words, every drink or meal out you have is being subsidised by very high tax payers.
Everyone has to be invested in the tax system for it to work and that is why some things remain universal and that includes DLA for disabled kids that is universal. The tax system is to say that when something catastrophic happens then the state will have your back regardless of your income levels because you have invested in the system.
On your view of things, people with money should have to fund their own discretionary NHS care eg for rounds of fertility treatment - why are you funding millionaires to have that on the NHS?
Moreover if you were to have a serious illness pretty much anything you pay in taxes will definitely not cover the cost of your treatment. Should the tax payer have to fund the cost of say your cancer hospice care when you own a house over a few hundred thousand? Why if you have an asset such as a house? Why should that be funded?
The way that DLA operates is to pay for the cost of things that are not provided by the state but alleviate the cost of the disability. In reality they make up for things that the state should provide but does not.
So for instance if you child has a language disorder in the old days the state would have provided wall to wall language therapy. Now the state rarely provides more than universal therapy for language disorder unless you have a fight. So parents have to try to get private speech therapists to support their kids at £80 her hour.
The same applied to occupational therapy and physiotherapist and the cost is similar. Oddly the more severe the disorder the less inclined to treat.
So kids with delay might get some SALT kids with severe disorder will have limited SALT and be written off
Usually parents are in dispute with the LEA as the LEA try to provide the least provision for the lowest cost - which is a crazy thing because the more is spent at the early stage the more likelihood there is of the child of reaching their full potential. To go to tribunal is hugely expensive. Usually there are the endless supply and need for updating medical evidence. There might also be legal fees and incidental fees to attend.
Heres the thing, The standardised medical reports produced by the NHS are very very brief but can also be quite chilling. They might write one side to let you know that your kid has a severely disordered language or motor issue that puts them into the lowest category. Parents are forced to spend huge amount to understand what is happening and how best to support their kids. They can get more detailed training on how to provide therapy and what aids and equipment to buy.
There are other expenses as well. The parents might not be able to go out without arranging care even when that child is above 14. They have to provide and obtain some for of PA support out of their own pocket every time they have a night off from care. Again legally speaking social care are supposed to do this but they don’t do what they should do under the EHCP plan and inform the plan re any social care needs. So that money is again applied to a failing of the welfare system.
There is also the provision of aids and equipment - this might be slightly better boots than those provided by the OT ( which are battered and fifth hand by the time they come to you) to stop toe walking. This might also be special care cutlery or a weighted blanket which in the old days were provided but not now.
Also those stupid sit cushions etc. parents can spend fortunes on sensory equipment. There are so many disability aids snd gadgets even the toys for toddlers are different to encourage fine motor skills. .
Moreover there might be some learning challenges that parents will try to support with extra tuition eg with say Maths due to poor working memory and language issues. This is not to support their kid to get a better grade but to actually function in society eg recognising that one from 2000 is 1999 at the age of 18. Again if successful this could aid independence and reduce the burden in the state. Also the child most likely can’t access many educational things in a universal setting eg swimming lessons due to hearing issues, physical issues or sensory issues. Some support groups might run things like this or else the parents have to fund 1:1 because the child cannot access school lessons.
The parents might have huge care costs for other kids as they have to visit their child in hospital. They might also have to take and visit their child in a major centre hospital eg London.
Parents might also pay for medical treatment that can have a huge impact but not available here eg to release muscles for CP offered in the UK when the kid is too old. Parents might prefer a better wheel chair than the ugly one provided by the NHS.
There will definitely be higher legal costs as parents need to draw up different types of wills etc. This is far more expensive than standardised.
Personally I refused to claim DLA until my son was really quite old due to some hang up but I was convinced that I should by NHS services precisely because they don’t have the capacity to provide the services that they decades ago.
For many parents having a disabled child is really expensive and the money is applied to treating the child or bettering their potential from low to not quite so low.
This debate is immaterial to me as my son is adult now and his finances are judged on their own merit. However I don’t begrudge the tax we pay combined as a household to other households towards DLA.