Im making a chilli con carne in my slow cooker?

I have popped all the ingredients in and THEN looked at the recipe! It says I should of added the kidney beans an hour before serving. Obviously I can't pick them all out now, is it for any health reasons that I should of added them at the end? I don't want to poison my kids! lol ! Also does anyone have any nice recipes maybe stews, soups, rice and risotto recipes they can p on? Thanks!