I have no problem with it. I feel if you think Halloween is evil then you should also think santa and the Easter bunny are evil. I enjoy seeing the kids in their costumes. I took my kids out when they were small so I will hand out till I'm older and have a hard time getting up. The kids do have to be there to get candy. If one is collecting for sibling that is home sick I just say well then I guess you'll have to share. Someone mentioned a parent coming to get treats for a sick child I would have told them go to the store and buy some candy so they could get home sooner to that sick child and that trick or treating should be less important than being with that sick child.
As for how much I hand out it depends on what candy I have, and how much I have. I start out usually with just one piece. If I'm not getting that many I'll up the amount. I usually try to turn off light around 8 or so.