According to Wikipedia it seems that if investigators exercised the same level of scrutiny to almost any welfare population the result would be similar:
"Welfare fraud is the act of illegally useing state welfare systems by knowingly withholding or giving information to obtain more funds than would otherwise be allocated.
Obtaining reliable evidence of welfare fraud is notoriously difficult.[1][2] Official figures of the prevalence of welfare fraud based on government investigation tend to be low – a few percent of the total amount of welfare spending. Interviews with welfare recipients where the interviewer has succeeded to gain a high level of trust, on the other hand, have shown that many, if not most, fail to report incomes.[3][4] Likewise, a survey of the general population has found that more than 80% are prepared to cheat on welfare if the risk of audit is only 1/6.[1] In most cases, welfare fraud involves modest sums and is committed by people who struggle with poverty, but once started it often continues after reaching financial stability.[5][6]"
Of course there is no excusing fraudulent behavior and we should be better as a whole than the general population. However, it does give some perspective...