Let me put your fears to rest. Cruising is one of the safest modes of travel -not to mention the fact that you're going to be fed well, have a great time, see wonderful sites and be pampered better than any other place I know.
My heart goes out to the families in Korea for their senseless loss. Don't let the act of a few people who mishandled this ferry to keep you from a cruise.
Happy Cruising, Mary