Daas Yochid, the only reason I broght that Gemorah down was to show that we have to be very concerned about causing Chillul HaShem(c^v). The Givyonim’s (and their possible sympathizers) ta’anah was a far-off one. Yet, the Gemorah says we had to be worried about it.
As far as the etzem zach goes — I wrote enough. See my posts. Also, keep in mind that it is not only that they don’t understand the inyan — they are not mechuyav al pi Halochah(or otherwise) to support all the Chareidim in kollel.