Snowboard halfpipe has been an Olympic event since Nagano 1998. Maybe you are thinking of snowboardcross which had it's Olympic debut in Torino 2006.
And again, to anyone arguing that it should not be in the Olympics, realize that you are arguing to keep the pro skiers from having an Olympic chance (an opportunity they ALL want). With that in mind, what makes you any better than FIS or the IOC if you are trying to RESTRICT the top freeride skiers from doing something they all want to do?Â
If you don't like it in the Olympics, don't go, and don't watch it on tv, that's all you need to do. Stop trying to impose your vision of the sport on other skiers, especially the pros who are putting their life into this sport.