cruises don't appeal to me at all. in fact, they're pretty much my nightmare vacation, essentially a combination club med/shopping mall/casino, except gigantic and floating on water, full of people and with no escape. and i love boat trips but give me a no-frills old sailing boat or refurbished navy boat and a bunk and i'm good.
that said, i don't think cruises are unsafe at all. 2 incidents with heavy media coverage, and the odd incident here and there, don't make an entire industry unsafe. tacky, boring and nightmarish, for sure, but not unsafe.