“You need a job but in order to find a job you must already have a job.”
No you don’t.
“What we really need are businesses who are open minded enough to at least ask applicants to explain GAPS in employment rather than assume that all those who are currently unemployed are in that state due to incompetence or inability to do the job.”
It’s not about open-mindedness. It’s that they’re (or at least the ones posting these announcements) so inundated with applications that they have to use some basis not to waste their time. Also, this sort of announcement isn’t all that common.
RE: “You need a job but in order to find a job you must already have a job.”
No you don’t.
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OK, can you then explain to me what the meaning of words like “Those currently unemployed need not apply”?
If this does not mean “you must have a job to find a job” (regardless of the advertiser’s intention), then I don’t know what else it means.