I think as we age, most of us reduce our circle of friends, sometimes deliberately, mostly just through attrition.
When we are younger our insecurities and our need to belong makes having lots of friends, and making sure we get invited to whatevers happening etc, seem important. We are joiners and our self esteem can be dependent on the size and status of our social groups.
I've traded that for quality over quantity and wish I had done it sooner.
Back closer to the topic, JWs act in this regard exactly as if they are in a cult - they need like minds to reassure them that their crazy beliefs are real, so everyone that shares that view is a friend. Everyone that doesn't - essentially doesn't exist. That the only people they choose to associate with beyond a superficial level are other JWs is sad beyond belief when it splits families and former friends.
As someone said, some good people trapped. But, unless born in, they chose that trap, so I don't waste too much sympathy on them. I met some well-intentioned people, as I knew I would, but in this case the path to madness was paved with good intentions.
I cant really think of any that I could see myself being friends with. The ideologies are just too opposing.
As always, its the born ins I genuinely feel for. It's child abuse via the imposition of a harmful lifestyle and mind conditioning.