I think most of you who have replied to this post have don't get the point.
I myself have a parent that uses XP, but I also have a background in tech support for Internet and OS, and I can tell you that few people like to change to something different. I can agree Ubuntu is safer and better, but some people, especially those advance in their years, refuse to learn and will panic at the first sign of trouble.
Those few that have helped your parents to use Ubuntu, I think that is an achievement, but not everyone can be as successful as you. And just because someone chooses to use XP instead of a Linux distro for their parents doesn't make them a troll or a n00b, they just know it is easier for them to have them use XP.
This is how I feel about my mother, she is use to the Windows Interface. If I switch it on her, no matter how much training I give her, she would never be happy with it. It has taken me years just to teach her to use Firefox, and yes I know Ubuntu is more secure and as I teach her how to do things with it, she wouldn't have as many problems, she would not be happy with it and just refuse to do anything to help herself.
There are few people who really want to learn anything about computers, they simply want it to do what they desire and that's it. And once they get use to a certain feel of something, that's all they want to do. I remember back when I did dial up support (the horror), I had a customer call in that wanted to help as they didn't understand how to use it. So I set up their dial-up through IE and got them online but they were disappointed as there was no interface like AOL had and decided to cancel just for that reason. I could have tried to explain how this was better than AOL and you could get all of the same kind of AOL features through the internet, but they hung up before I could try. They were comfortable in their little bubble and that is how most computer illiterate people are.