I know of several JW that have abused the system in the USA and many non-JW. It isn't that difficult to gain the system. However the lifestyle welfare provides isn't something that I would want.
There are plenty of folks though that don't mind collecting. A non-married couple with four children can get about $20,000 in cash and another $20,000 in other entitlements legally. I did taxes for a few semester for the IRS and my university as an outreach program and saw it first hand. They will need to have part-time jobs earning some money to accomplish it. Heck, now with the internet it is so easy to apply for benefits. The are lots of federal, state, and local programs that people are unaware of.