That's not evidence.
Even if we grant that there's a total identity between "vandalisers" and "layabouts," with 100% overlap in membership, AND that the free time made available by not having to take a job induces the desire to vandalise--both of which are highly dubious propositions to begin with--the crime that needs to be punished is the vandalism, not the layaboutery.
Right, because correlation does not imply causation. We don't have numbers.
Here, lets simplify it greatly and actually go ahead and create some hypothesises.
To Start we must define our terms:
W = The number of people on welfare in a given country
P1 = The percentage of people on welfare who do not desire jobs at all.
P2 = The percentage of people on welfare who would rather work, but are unable
P3 = The Percentage of people on welfare who desire work but find the work available beneath them*
L = The maximum hard number of outright layabouts on welfare that can exist without causing financial problems to the country in question.
C = The number of people who engage in criminal activity, including but not limited to vandalism, drug use, and disturbing the peace
P1c = The number of individuals who are part of both groups P1, and C
K1 = The percentage out of the total P1 group that group P1c occupies.
P2c = The number of individuals who are a part of both groups P2 and C
K2 = The percentage out of the total P2 group that group P2c occupies.
P3c = The number of individuals who are a part of both groups P3 and C
K3 = The percentage out of the total P3 group that group P3c occupies.
*Included in this category are the people with college degrees who don't want to take poor paying jobs, people to whom taking a job would not result in an increase in the standard of living from welfare, and people who previously had well paying jobs, that they have since lost.
Theory one (Lou's theory): (if I have set this up incorrectly Lou then I apologize, feel free to correct it)
P1=W
P1c=P1
W > L
K1 = 100%
Theory Two
P1+P2+P3 = W
P1c < P1
P2c < P2
P3c < P3
If anyone wants to submit theories feel three, I'm going to start trying to Acquire Data