I don't think anyone is perpetuating the idea that it's a lie, more that these people are extreme cases.
Tabloids actively hunt things for people to be outraged by...
Don't be silly, get the pitchforks and whale blubber torches out! ARRGGG! Tonight we dine on benefit scroungers!



The fact is, there will always be system cheats while the system can be cheated. These people make a tiny percentage of the general population of benefit claimants, who more often than not are genuine and just hard up for whatever reason.
If you want something to be angry about, look into Government squandering of tax money... It's something that every government do, just some are better at obfuscation.