Besides showing your players the folly of their actions by following through on the consequences on the lives of NPCs they never gave a second thought to, a good way of extracting drama in your game is to utterly shatter the illusions they had about how awesome they were.

Your players will love you for it. No, really.

Transcript

Jango Fett: I decided it was time to grab the Orb, but the Federation had a force field on it.
Jango Fett: I deactivated the ship's security systems and raced to the bridge - too late to stop them blowing up the moon.
Jango Fett: Maul would have gotten there in time...
[SFX]: Kchooo! {Jango fires a cable at Obi-Wan}
R2-D2: {inset} Ah, yes. This is where I single-handedly blew up the entire ship and saved the day.
Jango Fett: I got the Orb and was heading for an escape pod, when one of your fighters got a lucky hit inside the hangar.
R2-D2: Lucky?!
Jango Fett: It never even would have made it in there if the force fields had still been active.
Jango Fett: The explosion threw me into space. I lost the Orb, but survived long enough to climb into a capsule airlock before I passed out.
[SFX]: Yank! {Obi-Wan wraps the cable around a pillar and pulls hard on it}
Jango Fett: Everything was ruined. I was scarred by hot shrapnel. I found out later my partner was dead.
[SFX]: Krunch! {Jango crashes to the ground}
Jango Fett: Murdered by a Jedi Padawan named Obi-Wan Kenobi.
Jango Fett: I swore revenge against the Republic, against the Jedi, and most of all...
Jango Fett: Against you.
Obi-Wan: Let me get this straight. The only reason our fighter managed to destroy the HQ ship is because you removed its defences?
R2-D2: Hey, that's not important right now!