I would think that if anyone found themselves in prison, the last thing on their minds would be singing Kingdom Songs, or any other songs for that matter.
Also, on the subject of forcing young children to sit through two hours of meetings designed for adults, the contrast between how children are treated at KHs and the Methodist church up the road to us is quite an eyeopener.
A couple I know who did not belong to any particular religion decided, out of curiosity, to go to the local Methodist church one Sunday with their very young daughter who had never been inside a church before. As soon as they walked in they were given a very warm welcome, but the warmest welcome of all was directed towards their little daughter. A nice, kind lady asked her if she would like to join the other children in the Sunday school while Mummy and Daddy sat in the main church listening to the Vicar. She gently took her by the hand and lead her into the adjouning room, smiling and chatting all the time to put her at her ease.
Well, the parents had a peaceful hour giving their full attention to the sermon while their daughter enjoyed herself in Sunday school learning about the bible in a gentle, fun, age related manner. When the service was over, all the children came skipping out of Sunday school with drawings of the bible characters they had been learning about during the hour. Everybody was stress free, no children had been forced to sit still on uncomfortably hard chairs staring straight ahead of them listening to a droning voice that they could not understand. The children were treated with respect and dignity, being taught in a manner appropriate to their ages and most importantly of all, made to feel welcome.
Given a choice, if I were a child I know for sure which religion I would prefer to join!!