Can a genius person commits crime and get away so easily?

You know what I’m talking about if you have already watched the ‘Wild things’ series,or maybe the ‘Perfect Stranger’. It’s more about a smart person that can easily kill others and get away with out any trouble.

So lets take this matter to reality,We might have seen some homicide issue where the ‘victim’(if you believe this person is a victim) admit that he/s have no choice but must kill others for self-protection in dangerous situation,it was an accident,he/s was set up by others,and other convincing excuses in order to get away,and the judge decide that they are innocent most of the time(some people agree,some disagree). What if this genius person have already planned the whole scenario so it would be ‘real’ for law and others? I’m not saying that responsible law department and the authorities are less intelligent but I believe they and people can be easily manipulated by a “smart” person/people.

Anyway,what I really want to know is that could a genius person/people kill others and get away if they really can do it? In reality of course.