DUI or DUMB?

What is it with celebrities who clearly can afford a limo or at least a damn taxi but still insist on driving their own car while drinking? Along with the Paris Hiltons of the world, and all those other collective rehab queens, I read in the news today that Keifer Sutherland has now been charged with a DUI. Dammit people, take a fucking taxi! Clearly fame and fortune has clouded their judgment, either that or they were dumb asses before their DUI's...