It's a double edged sword for the WTS.
If they encourage get togethers the likelihood of individuals doing inappropriate stuff grows AND people talk and share their feelings more openly with those they are close to - more frequent and church organized get togethers draw people together.
This is definitely an individual congregation thing. Some are loving and active and others are cold and almost anti-social.
You have to be the right person at the right KH in order to have a full social life.
BUT,
Even for those that do have full social lives none of it is organized and sanctioned by the WTS. There are no open houses (after dedication) of KH or official goody nights at bookstudy or sunday school or men's club or mother's club or anything. Why don't KH's have small playgrounds for the children - then they would have adults and children associating with each other and building each other up.
BECAUSE
When dubs get together too much and become too comfortable they may start to wake up. The more sanctioned gatherings there are that aren't completely controlled the greater chance that non-conformist thoughts would hit the group.