Just to clear up a couple of points. Hapkido came from Daito-ryu, not aikido
http://en.wikipedia.org/wiki/Hapkido. We can wonder perhaps at the motivation of the founder of hapkido adopting the same name (in Chinese letters) as O Sensei for his new art.
Years ago I trained as a visitor at a hapkido dojo (dojang) in Korea. It wasn't at all violent. There were a lot of kick attacks, including from suwari waza. The ukes blended much more than I was used to doing in aikido in Aikikai dojos. The wikipedia article mentions the influence of Taekkyeon - a dance-like martial art - and that was apparent. There was also musical accompaniment.
http://en.wikipedia.org/wiki/Taekkyeon