I know what you mean... feeling guilty since you are out with your own children getting candy from others, yet no one is home at your own house to pass out candy. Here's what I have done for the past few years......
My neighbors are always home on Halloween since their children are all grown up. I write a note on my door that says.... My neighbors have my bowl of candy to share with you. Happy Halloween! Have fun! (My neighbor passes out her candy first and then grabs my bowl and says here's some more candy from the family/house next to me.)
So.. that's an idea.... not sure if your next door neighbors are home and wouldn't mind doing this for you. I feel much better trick or treating knowing that at least my neighbor is passing out my candy for me. (I am only gone for an hour since that's a long enough time for young kids.)
Another thought.... you could always have someone you know well, hang out at your house to pass out candy.
But... don't worry really.... you would not be the only one who does not answer their door on Halloween. I just tell my kids we are not walking up to the houses if the lights are off.