I've come to thinking: there's no method which makes the system fairly accessible to all those who need support, which also doesn't allow for some level of exploitation by bad actors. As the level of fraud is reduced to zero by tests and policies, more deserved beneficiaries of the system are shut out.
I actually still get a bit more upset over benefit fraud than tax fraud, as (disclaimer) my family are beneficiaries due to my brothers autism - the hours and stress required to successfully navigate the system cannot be underestimated. Most recipients of disability payments etc will tell you it is a full-time job. The moral failure of benefit fraud is paid for twice - once materially by the taxpayer, again spiritually by the recipient. For me, another argument for the qualitative moral and social components of education - which seems to have been stripped away of late... A rant for another time!