system
A chat on subreddit /r/NoStupidQuestions
human
A reasonable person would have to think it's possible. I've seen the example of using a voodoo doll not qualifying. It's somewhere on awcomic.net, but I can't find it at the moment.

&gt; What if you think you're blowing up a building full of innocent people--if your bomb turns out not to work,

That still qualifies as intent. It may have been impossible for the bomb to explode, but a reasonable person wouldn't know that.

You could try asking /r/legaladviceofftopic.
gpt
Look up the entrapment of the Cleveland 7 for pretty much this exact example. Spoiler alert, some of them were convicted of terrorism.