Yes, it's fair because I wouldn't expect that stipend to be required to pay for whatever extra medical costs said cripple had. Further a "fair" system is never

Yes, it's fair because I wouldn't expect that stipend to be required to pay for whatever extra medical costs said cripple had. Further a "fair" system is never going to abolish all unfairness inherent in human existence - at a minimum it just needs to provide sufficient support that those who are struck with particularly bad luck don't suffer unnecessarily for it.