Every trial I have ever watched reveals just how stupid caught criminals are, they all think they are the smartest thing ever, and they are the ones who are so clever that they will never see the inside of a court as a defendant, but every day in every country we see men and women who thought they had the best plan, that they would murder their intended victim and they would be able to carry on with their lives with their said victim/s cold in their grave,
in many cases they soon realize their plan wasn't as good as they thought, and they are soon in the county jail, starting the long process from arrest to trial to conviction, (I have seen trials where I could not convict as state didn't reach BARD but I thought defendant did it, I have seen trials where defendant IMO was innocent Mark Jensen and Brendan Dassey are 2, but for the most part the defendant did it, and is convicted).
And most of them are so stupid that they voluntarily speak to LE, because they think LE will buy their story, and that is the first stupid thing they do.