Coincidence? Who knows?

"Is it still bad luck if a black cat crosses your path, but you hit it with a car? Don't you think hitting it would negate the bad?"* I was asked these questions in a tone that demanded serious attention. I was in absolute disbelief when I found myself pondering them. Even if one isn't superstitious, s/he still knows the rhymes and sayings. To name a few: step on a crack, you'll break your mother's back, find a penny, pick it up, and all day you'll have good luck, and break a mirror, and you'll suffer seven years of bad luck. Some people seem to find legitimate truth to these sayings, based on their personal experiences. Another topic from that category I ponder frequently is karma. Fortunately, I am at a point in my life where I do "good" things because I want to. Unfortunately, this a recent development. Previously, it seemed as though every time I went out of my way to be kind, I found myself in a positive situation. If I chose to do nothing, nothing ever happened. To this day, no matter how I've been wronged, I find myself punished for seeking revenge. These events could be complete coincidence. My question is, could statistical probability be considered proof of a fact? Either way, the thought keeps me from keying my ex's car.

*This same person wants to know, "If a turtle loses it's shell, is it naked or homeless?" A dear friend of mine called him an idiot for it, and supplied the answer "niether. It's dead."