The problem is very like Nuclear Fission. If a critical mass of a radioactive substance is allowed to accumulate, self destruction inevitably follows. Damage is widespread.
This is what happens when welfare recipients of any stripe are allowed to accumulate in dense populations (Critical Mass).
Poor people and welfare recipients who are widely disperssed do not cause these conditions.
It's the 'Housing Projects" Stupid!
Yes they do, just not as visibly. here in California it's known as "Section 8" housing. If you spread the misery it's simply less visible.
Every one of these "section 8" homes have a circle of misery around them which is experienced by only a dozen or two unlucky normal, unsubsidized families.
Not worth making the national news...