Well, why didn't Frodo use the eagles to fly him directly to Mount Doom to drop the ring? Because it would have been such an awfully short story. But it would have saved him a long and tiresome journey...
I've been thinking of that many times, that it would be so easy just to waltz in to any palace and kill the Jarl right there, be it Ulfric, Elisif or anyone (if we ignore their essential tags, of course). Of course, anyone who tried this would immediately be jumped by the housecarl and a bunch of guards, but the Jarl would still be dead and a true fanatic wouldn't care if he/she died in the process.
To force Ulfric haters to sit around sticking pins in their Ulfric voodoo dolls shouting "FOR THE EMPIRE! FOR THE EMPIRE!"

(I used to be mad that the second Boethiah quest where you got to kill Elisif was never implemented in the game, because I wanted her clothes. Then I got a PC instead.

)