As I don't really believe in luck per se, I would say that to constantly be messing up on the same or similar things is not due to luck or being useless, it's lack of perspective to be able to see what the core issue is. Likely there is a lesson to be learned in a particular area, hence the continual screw-ups. They need to learn the lesson so they can lessen the learningWould you say constantly messing up is "bad luck" or the said person messing up is just a useless fool? That is the question, I wish I had a answer.

I'm just a useless fool... (and a few stronger words after that
Don't make me internet-slap you...you are neither useless nor a fool. Unless you are a jester who cannot entertain and then you would be a useless fool in a literal sense.