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Think about the sort of people who might do this… not really brilliant planning. 
Intelligent, capable people are rarely going to think that murder is a good solution to a problem, because it isn’t. Of the few intelligent people willing to commit murder, most are doing it in a moment of passion, or out some sort of extremely demented urge like a serial killer’s. It doesn’t matter how bright you are if you do things on a whin, you’re going to make mistakes, and it only takes one to catch you.
Of course there are killers who weigh the pros and cons, carefully plan the crime and execute it, but they’re pretty rare. Most people who get away with murder get lucky, either in terms of victim selection (people who won’t be missed) or law enforcement incompetence.
Big news around here, but how could he be that stupid and leave an evidence trail like that?
Lot of good the mask and gloves did him.