PCs generally don't need much encouraging to do something rash. But that doesn't mean that you shouldn't encourage them. Because with any luck they'll do something even more rash than you could have imagined, and that's when the fun really starts.

Transcript

Luke: Oh man. This looks terrible.
Palpatine: I have looked upon all that the universe has to hold of horror, and even the skies of spring and the flowers of summer must ever afterward be poison to me. But I do not think my life will be long.
Luke: Why do you say that?
Palpatine: There are black zones of shadow close to our daily paths, and now and then some evil soul breaks a passage through.
Palpatine: When this happens the man who knows must strike before reckoning the consequences.
Luke: Yes. Yes, I think I begin to understand...
[SFX]: Force pull!
{Luke swings laser sword}
[SFX]: WHOOOM!
{Vader blocks}
[SFX]: KRZZRZZRKKZK!!
Darth Vader: I'm sorry, Luke. I'm afraid I can't let you do that.
Palpatine: From even the greatest of horrors irony is seldom absent.
Palpatine: Ah ha ha ha ha!!