
Berkal |

As always, I think it's a little of everything. You as a DM want 'role'players (or at least players who will RP sometimes) and your players want to 'roll'play. I like the point about having fun - could very well be that the players just want to hack things, it's how the enjoy things - you can either ask them if they'd like to try a more balanced style, adjust your expectations, or find a new bunch.
However, if the examples weren't exaggerated, then I think a new 'by-the-book' campaign is in order too. No rolling until they have all 18's - use point-buy, and then in the game stick to the DMG wealth levels. That should solve the majority of the god-like PC's. As for killing the King, if the no longer have Thor's Hammer to help them escape, getting cut to ribbons by the royal guard + royal wizard might (might!) bring about a change in tactics.
Good luck