If a person constantly thinks or fantasises about murder or envisions themselves as developing into a murderer, will they become one? Is it possible if they crave it? Well I have a friend as such and was wondering if in fact they will become one. He was so detailed in how he would do it.

How do I know this? Well he had read my diary, so I read his with him knowing and discovered all of this. Not to mention that he had bought a massive blade and carries around proudly. So will it progress?

Thanks.
'without him knowing