If nothing else, this kind of analysis is good for giving the human brain, the best pattern matching and pattern noticing system known to mankind, the opportunity to look at something and say, "that looks a little weird." It's a way to direct the attention.
Yeah, but look at all the random crap that will do the same thing... as awesome as we are at picking out patterns, we just can't cope when there isn't a pattern. Though I suppose philosophically one might argue there is always a pattern.
Philosophically, there is definitely not always a pattern. Paradelia is a real cognitive failure. Unfortunately, it happens all the time.
Also unfortunately, there are patterns all over the place that really exist. How do we differentiate the two? Well, the first step is to try and recognize what patterns that we can – even if some of those are going to be false positives.
You miss 100% of the patterns you don't spot.