I'm not sure that's a sign of PTSD. Lots of people do that. For instance, it's common to believe that good things happen to those who think positively. As a result, average people often refuse to improve their conditions because that would require acknowledging that something is wrong, which is "negative".

I can see how normal superstitious/magical thinking could lead to OCD if it were taken to extremes, but I've never heard of it being associated with PTSD. I does make sense that a feeling of powerlessness might lead to that.