You are missing the point.
Johnny is a tosser, failed at school, never worked a day, has no social skills, is from a broken home. Johnny smokes rollie tobacco, drinks 10 cans of Tuborg a day, eats fozen processed food and plays Xbox most of the day. He doesn't care, he collects his €188 a week off the taxpayer and gives two fingers.
But he hasnt committed a crime.
The Social call him up and say that they have a job interview for him as a factory worker. He turns up for the interview but is clearly so uninterested that the employer refuses to give him the job.
So what do we do about Johnny?
We can take his welfare off him, or even cut it? And its possible that Johnny turns over a new leaf, invests in a new suit, and sets off trying to build himself a career.
Or, Johnny can decide rather than smoking rollies, he could sell some, make a few quid on the black market. Not only that, he sees an opportunity to sell other 'gear'. Its easy work and easy money, johnny doesnt care.
In the meantime, the State, having saved €5,000-€10,000 in welfare payments, pays that in Garda overtime to catch Johnny and his mates dealing. When they do catch Johnny, the States forks out €2,000 in free legal aid. When convicted, the State pays a further €10,000 for the week in prison. Johnny gets out and starts dealing again.
Of course, not everyone will act this way upon their welfare being cut, some people, perhaps graduates for example, might emigrate, reducing the talent pool in the country.