“How would an eruv cause “mingling in the streets?” Without an eruv, people will mingle in the streets with empty pockets; with an eruv, they’ll mingle while carrying stuff. What difference would it make?”
Most young women with children won’t be out in the streets on Shabbos if there’s no eruv.
“I don’t even understand the problem with restaurants, so I really just don’t know anything.”
Restaurants have been a tznius problem that the rabbonim have been crying to the tzibbur about for many many years.