Sorta like Jehovah's Witnesses  

 It's the right thing to do, but there's this feeling of loss over what could have been. 

You see so much potential in someone, and they are simply not interested in unlocking it. I feel a lot of sadness when I think about it with some friends. 

 Well that is their decision, not yours. Forget about it. 

 It’s a frustrating feeling. Seeing someone who is cable of doing better not even making an attempt 

 Yup. Aside from moving for more isolation, best decision I’ve made.