It seems to me Mormons are able to live a day to day life that doesn't shut out and condemn the rest of the world in terms of Education, School Activities, Sports, Careers etc. Perhaps Mormons who leave the church have an easier time assimilating into normal society because they've got their bases covered in terms of work and education and how to mingle with others.
We former JW's have never even so much as celebrated a birthday or been part of anything that didn't revolve around the meetings. When we leave, we loose not only our friends and family but we are recovering from the loss of a false hope of everlasting life.