You could, but that would be a stupid thing to do, as would planning a murder that you have no intention of committing just "for fun". If you do that, well, hope no one finds your plans.

Jurors aren't mind readers. We have have a practical way to determine there was intent. Creating a plan to commit a crime shows intent. If you were doing it just because you're an ass-hat then you may pay the price for being an idiot.

No reasonable person is going to document a plan for a crime they have no intention of committing. You're living in a theoretical fantasy land.

Plenty of people fantasize, to great lengths, about killing some one who has wronged them. Under your view 99% of the population should be in jail because they've thought about killing someone.

You're obviously not reading what I write. I'm not talking about fantasizing, I'm talking about planning. not the same thing.

What would you suggest that we do with someone caught with plans to bomb a building? Let them go until they actually do it and then arrest them?