Roger Ramjets
Philosopher
I think - or at least hope - that these situations are rare. The majority of murders involve criminals who have a history of violence and are almost certainly guilty. The police are well familiar with this type and know how to deal with them.That's kind of what actually happens, isn't it?
It is when such a crime involves 'ordinary' people that the police tend to go astray. Assuming that the suspects are lying - but can be broken with enough pressure. Overestimating the significance of innocent actions and random coincidences. Going with gut feelings rather than dispassionately weighing up the evidence. In a normal investigation these techniques work because the suspects usually are lying, behavior patterns often are significant, and gut feelings are often correct. But when tackling an unusual crime they are already outside the norm, so assuming that the usual probabilities apply doesn't work.
The David Bain case appeared to be a simple murder/suicide. But some things didn't 'add up' (gut feelings), and the police don't like a crime with no criminal to convict. So they latched onto the sole survivor, assumed he was guilty, and tried to unmask him. Perhaps he really did it and they were going down the right track, but the evidence they got wasn't sufficient to prove it. Had they not been so sure, they might have collected more reliable evidence - and then there wouldn't be any doubt about his guilt.
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