I don't know what post/thread you a referring too but if some one is a gambling addict yes they are responsible for their actions but addictions can be uncontrollable - To say Stars ruined your life wouldn't be how I would word it, or how Poker ruined my life - I would word it like "My addiction ruined my life"
It's easy for me to go "you shouldn't smoke" because I don't smoke and I'm not addicted to it but anyone who smokes can tell you just how hard it is to quit..
As for me I like gambling I like the rush I don't gamble in slots
or things where no matter how good I get I can't win in the long run, I like games where If I get better my losses become lower or my wins become higher.
However moderation is key in things like this (which for me moderation isn't not doing the activity such as poker but it's controlling my bank roll and limits I play)