"Why should we have unnecessary social contact with people who still pursue worldly ways and who have not become worshipers of Jehovah?"
I don't know, maybe social contact with outsiders in a social setting might convince them that you are not the insular, vicious death-cult* that you actually are? 🙄
They've painted themselves into a bit of corner by their exclusivity. By shunning people who aren't convinced but would be happy to support their friends and family who still are, they miss out on the benefits of being a highly regarded mainstream religion. Nominal Catholics don't raise any eyebrows, still attend the occasional mass and probably put a few dollars in the plate when they do. JWs only have one special "feast day" where hangers on can attend. And I imagine that it's risky to attend for faders because the elders may notice them.
A few social gatherings where you can bring a friend probably wouldn't be as detrimental as the disconnected-from-the-rest-of-humanity Bethelites fear**
Blondie, do you have a source for that segment you quoted?
*Bragging about the children they've killed through the blood doctrine and having HLCs to ensure more of those deaths makes them a vicious death-cult, IMO. Suicides due to shunning probably doesn't help their image, either.
** It's always about fear, isn't it! It's their prime motivator.