I have to wonder how much life experience you have with people on long-term social assistance. Many of them just don't have much of a work ethic. Of the ones I know, I wouldn't hire many of them to watch paint dry.
We have to acknowledge psychological and physical disabilities that prevent them from holding on a job. The abilities to be at work at 8:00 a.m., get something productive done, and stay until 5:00-----and then come back tomorrow to do all over again is just not in their value system. A UBS will not turn these people into reliable photographers, computer technicians, or even truck drivers.
One thing I like about the UBI is that these people are no longer in the job market. More capable people get the jobs--and stay longer; employers don't have as much expense of hiring and firing a dud employee, and these people, who can't handle the rigors of a regular job, should have enough money for a subsistince existence.
Your case for UBS is weak. You will need to write a much better essay to convince others. See if you can address my points.