They run off because they are smart. If I was a prisoner and someone started killing my captors, I would not wait around for introductions. I don't know their intentions.
As for giving them things, they don't seem to use it, nor do they thank me for it, nor do I get a boost from the game, like when you give a coin to a beggar. So, now I just release them when I can and leave them to their fate. Freedom is enough of a gift.
Well you get a speechcraft +10 bonus for 1 hour(?) if you give a coin to a beggar. I always do that before heading to a shop.
er, did I read that wrong and you did know you got a bonus? meh..
it sure would be cool if there was a karma system where you got disposition increases for doing stuff like that.